Use what you know about square roots to complete problems 7-10.
7. When does a quadratic equation in the form ax + b = c have only complex solutions?
8. The area of a square with sides of length s is given by s. The area of a square is 40 square
centimeters. What is the length of one side of the square?
9. The area of a circle with radius r is given by mr. The area of a circle is 60 square millimeters.
What is the radius of the circle?
10. The surface area of a cube with sides of length a is given by 6a². If the surface area of a cube
is 200 square inches, what is the length of one side of the cube?

Answers

Answer 1

X2 + 7x + 10 = 0 has roots -5 and -2, the answer.

How to Find the roots of the equation x2 + 7x + 10 = 0?

x2 + 7x + 10 = 0 is a mathematical equation.

x2 + 5x + 2x + 10 = 0 [dividing the middle term] is another way to express the aforementioned equation.

After factoring 2 from the second term of the expression, 2x + 10, and x from the first term of the expression, (x2 + 5x), the expression may be broken down into its constituent parts.

We obtain the factorized equation as follows: x (x + 5) + 2 (x + 5) = 0.

Now we can calculate (x + 2) (x + 5) = 0 by utilizing the distributive property.

The result of separately equating both terms with 0 is,

The equation x2 + 7x + 10 = 0 has -5 and -2 as its roots.

The Complete Question is :

How to Find the roots of the equation x2 + 7x + 10 = 0?

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Related Questions

Math on the Spot An arcade deducts 3.5 points from
a 50-point game card for each game played. The linear
equation y= -3.5x + 50 represents the number of
points y on a card after x games played. Graph the
equation using the slope and y-intercept.

Answers

For the linear equation y = -3.5x + 50 the graph is plotted with points (0,50) and (14.28,0).

What is a linear equation?

A linear equation is one that has a degree of 1 as its maximum value. No variable in a linear equation, thus, has an exponent greater than 1. A linear equation's graph will always be a straight line.

The linear equation is y = -3.5x + 50.

An arcade deducts 3.5 points from a 50-point game card for each game played.

The graph will represent the x axis as number of games played.

The graph will represent the y axis as points earned.

Substitute the value x = 0 in the equation -

y = -3.5(0) + 50

y = 50

The coordinate point is (0,50).

Substitute the value y = 0 in the equation -

0 = -3.5x + 50

-50 = -3.5x

x = 14.28

The coordinate point is (14.28,0).

Plot both the coordinate points and join the line.

Therefore, the graph is plotted for the linear equation.

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A rectangular garden has a walkway around it. The area of the garden is 6(4.5x + 2.5). The combined area of the garden
and the walkway is 6.5(6x + 6). Find the area of the walkway around the garden as the sum of two terms.

Answers

Answer:

2w^2.

Step-by-step explanation:

Let "w" be the width of the walkway. Then, the length of the garden is 6.5(6x + 6) - 2w and the width of the garden is 6.5(6x + 6) - 2w.

The area of the garden is 6(4.5x + 2.5) = 6 * 4.5 * x + 6 * 2.5 = 27x + 15

The area of the garden and walkway is (6.5(6x + 6) - 2w)^2 = 27x + 15 + 2w^2

Equating the two expressions for the area of the garden:

27x + 15 = 27x + 15 + 2w^2

Thus, the area of the walkway is:

6. In a market economy
a. an individual consumer has a great influence on the price of goods and services.
b. consumers do not influence the price of goods and services.
c. all consumers collectively have a great influence on the price of goods and services
d. all consumers collectively have no influence on the price of goods and services.
nomic terms?

Answers

In a market economy, option C. all consumers collectively have a great influence on the price of goods and services.

What is a market economy?

A market economy is an economic system in which goods and services are traded in a market, and prices are determined by supply and demand. The decisions of individual consumers and producers, operating through the market mechanism, determine what goods and services are produced and how they are distributed.

Therefore, the correct answer is as given above. It could be concluded that market economy allow individuals to influence the price of goods and services

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PLEASE YALL HELP ME WITH THIS I NEED IT FOR RN

Answers

The piecewise function for the Tax due on an income of x dollars are:

T(x) = 0.035x; if 0 < x ≤ $15,000T(x) = 525 + 0.0625 (x- 15,000); if 15,000 < x ≤ 30,000 T(x) = 1462.50 + 0.068 (x - 30,000); if 30,000 < x

From the case, we know that there are 3 scenariois for filling tax due based on an individual's income, where:

Between $0 until $15,000 is taxed 3.5% of taxable incomeBetween $15,000 until $30,000 is taxed $525 plus 6.25% of excess over $15,000Over $30,000 is taxed $1462.50 plus 6.8% of excess over $30,000.

To construct the piecewise function for the Tax due, we need to translate the given conditions into mathematical formulation.

We assume that:

T(x) = tax due

x = $ amount of taxable income

For taxable income between $0 until $15,000, the tax is 3.5% of taxable income; then:

T(x) = 3.5% x

T(x) = 0.035x

For taxable income between $15,000 until $30,000, the tax is $525 plus 6.25% of excess over $15,000. Then:

T(x) = 525 + 6.25% (x - 15,000)

T(x) = 525 + 0.0625 (x- 15,000)

Please note that the additional 6.25% only will be counted based on the remaining of the taxable income deducted by $15,000.

For taxable income over than $30,000, the tax is $1462.50 plus 6.8% of excess over $30,000. Then:

T(x) = 1462.50 + 6.8% (x - 30,000)

T(x) = 1462.50 + 0.068 (x - 30,000)

Please note that the additional 6.8% only will be counted based on the remaining of the taxable income deducted by $30,000.

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what is the value of the expression hurry please!

Answers

Answer:

50

Step-by-step explanation:

On his sixth birthday, a boy inherits $6000 which is to be used for his college education. The money is deposited into a trust fund that will pay him
R dollars on his 18th, 19th, 20th, and 21st birthdays. Find R if the money earns 8% interest compounded annually.
The money deposited will pay the boy $ on his 18th, 19th, 20th and 21st birthdays.
(Round the final apower to the nearest cent as needed Round all intermediate values to six decimal places as needed.)

Answers

On solving the provided question, we can say that by solving the interest  the amount after his 21st birthday =  $ 10,806

what is interest ?

Simple interest is calculated by dividing the principal by the interest rate, the passage of time, and other elements. The formula used in marketing is simple return = principal + interest + hours. Using this approach, interest may be calculated most easily. The most common way to calculate interest is as a percentage of the principal balance. If he borrows $100 from a friend and agrees to pay it back with 5% interest, for instance, he will only pay his proportion of the 100% interest. $100 (0.05) = $5. You must pay interest when you borrow money and charge interest when you lend it. The majority of the time, interest is calculated as an annual percentage of the loan balance. This proportion is referred to as the loan's interest rate.

P = $6000

Rate=  4 %

Time, t= 12 years  

Formula of Compound Interest

[tex]A = P(1+R/100)^T\\A = 6000(1+4/100)^{12}\\A = 9606.19332[/tex]

On his 19 th birthday

[tex]A = P(1+R/100)^T\\A = 6000(1+4/100)^{13}\\A = 9990. 44106[/tex]

After 21st year S. I is

S. I =  10390.058700 × 4/100

S. I = 415.602348

A= 415.602348 + 10390.058700

A = $ 10,805.661.

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47) A convention manager finds that she has $1370, made up of twenties and fifties. She has a total of 46 bills. How many fifty-dollar bills does the manager have?

Answers

The number of fifty dollars with the manager are 31.

What is Equation?

Two or more expressions with an Equal sign is called as Equation.

Given that a convention manager finds that she has $1370, made up of twenties and fifties.

20x+50y=1370

She has a total of 46 bills.

x+y=46

x=46-y

Now we have to plug in x value in equation 1

20(46-y)+50y=1370

920-20y+50y=1370

920+30y=1370

Subtract 920 on both sides

30y=450

Divide both sides by 30

y=15

Now plug in y value in x+y=46

x+15=46

Subtract 15 on both sides

x=46-15

x=31

Hence, the number of fifty dollars with the manager are 31.

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1522 customers at a major retailer were surveyed whether or not they made a purchase and were satisfied with the service they received. The table below organizes the responses.


Satisfied with Service
Not Satisfied with Service
Total
Made a Purchase
130
494
624
Did Not Make a Purchase
715
183
898
Total
845
677
1522

What are the odds that a shopper selected at random was satisfied with the service they received?

Answers

Probability that the shopper selected at random was satisfied with the service they received is 845 / 1522.

What is Probability?

Probability is simply the possibility of getting an event. Or in other words, we are predicting the chance of getting an event.

The value of probability will be always in the range from 0 to 1.

Total number of customers = 1522

Out of these,

Number of customers made a purchase = 624

Number of customers not made a purchase = 898

Number of customers who purchased satisfied with the service = 130

Number of customers who does not purchase satisfied with the service = 715

Total number of customers who are satisfied with the service = 130 + 715 = 845

Probability that the randomly selected shopper satisfied with the service = 845 / 1522

Hence the probability is 845 / 1522.

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Han wants to buy a $30 ticket to a game, but the pre-order tickets are sold out. He knows there will be more tickets sold of the day of the game, with a markup of 200%. How much should Han expect to pay for the ticket if he buys it the days of the game?

Answers

Han should expect to pay $90 for the ticket if he buys it the day of the game.

What is percentage?

Percentage is defined as a given part or amount in every hundred. It is a fraction with 100 as the denominator and is represented by the symbol "%".

Han should expect to pay $90 for the ticket if he buys it the day of the game

The current ticket fee = $30

The markup = 200%

The markup = 200% of the current price

Markup = 200/100 ×30

= $60

The ticket fee on the game day = The current fee + The markup

The ticket fee on the game day = $30  +  $60

The ticket fee on the game day = $90

Hence, Han should expect to pay $90 for the ticket if he buys it the day of the game.

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(100 POINTS!) What is the sum of 6 of the interior angles of a regular octagon?

Answers

[tex]\underset{in~degrees}{\textit{sum of all interior angles}}\\\\ S = 180(n-2) ~~ \begin{cases} n=\stackrel{number~of}{sides}\\[-0.5em] \hrulefill\\ n=8 \end{cases}\implies S=180(8-2)\implies S=1080 \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{just one angle is}}{\cfrac{1080}{8}\implies 135^o}\hspace{5em}\stackrel{\textit{for six angles}}{(6)(135)\implies \boxed{810^o}}[/tex]

6x6 foot area. Use this value to estimate the size of a crowd that is 5 feet deep on both sides of the street along a 3-mile section of a parade route.

22000
44000
4800
8400

Answers

The size of the crowd that is 5 feet deep on both sides of the street along a 3-mile section of a parade route is 44000 people.

What is area?

Area is defined as the total space taken up by a flat (2-D) surface or shape of an object.

Given that, the size of a crowd that is 5 feet deep on both sides of the street along a 3-mile section of a parade route,

The number of people that can fit comfortably in a 6 feet by 6 feet area = 10

The ratio of the number of people per unit area = 10/(6 × 6) = 10/36

The area, A, occupied by the crowd = 5 feet × 3 mile × 2

3 miles = 15840 feet

∴ A = 5 feet × 15840 feet × 2 = 158400 ft²

We then have;

Number of people / 158400 = 10/36

Number of people = 44000

Hence, the size of the crowd that is 5 feet deep on both sides of the street along a 3-mile section of a parade route is 44000 people.

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An artist creates a cone-shaped sculpture for an art exhibit. If the sculpture is 5 feet tall and has a base with a circumference of 26.376 feet, what is the volume of the sculpture? Use 3.14 for 1.

Answers

The volume of the sculpture is 92.316 feet³.

What is a cone?

It is a shape of a Christmas tree where there is a base of radius r and a top point called the apex.

The volume of a cone is (1/3)πr²h.

We have,

Cone-shaped sculpture:

Height = 5 feet

Base circumference = 26.376

This means,

2πr = 26.376

r = 26.376/(2 x 3.14)

r = 4.2 feet

Now,

The volume of the sculpture.

= 1/3 x 3.14 x 4.2 x 4.2 x 5

= 92.316 feet³.

Thus,

92.316 feet³ is the volume of the sculpture.

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Work out the following sheet,please

Answers

a) The measure of <ABC is 131 degree.

What is Angle sum property?

According to the triangle's "angle sum property," a triangle's angles add up to 180 degrees. Three sides and three angles, one at each vertex, make up a triangle.

The total of a triangle's three internal angles is 180 degrees, as stated by the angle sum feature of a triangle.

Given:

a) As <ACD= 90

and Triangle BCD is an equilateral triangle then each of its angle measure 60 degree.

So, <ACD= 90

<ACB + <BCD = 90

<ACB = 90 - 60

<ACB = 30

and, <BAC = 19

Using Angle sum property in Triangle ACB

19 + <ABC + 30 = 180

<ABC = 180 - 49

<ABC = 131 degree.

b) Bow, In Triangle HEF using Angle sum property

<E + <F + <EHF = 180

<EHF = 180 - (69+ 40)

<EHF = 71 degree.

Then, <GHE + <EHF + <FHI

= 72 + 71 + 37

= 180, which forms on straight line.

Thus, GHI is a straight line.

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Seth owns a printing shop that makes customized T-shirts. The cost to make T-shirts is proportional to the number of T-shirts he makes. Seth graphs a line that shows the cost per customized T-shirt. Two points on the line are (2, 8) and (4, 16). What does the slope of the line mean in this situation?
Group of answer choices
a. The cost is $4 per T-shirt.
b. The cost is $2 per T-shirt.
c. The cost is $0.25 per T-shirt.
d. The cost is $8 per T-shirt.

Answers

the slope of the line means in this situation "a. The cost is $4 per T-shirt".

What is a Linear equation?

A linear equation is an algebraic equation of the form y=mx+b, where m is the slope and b is the y-intercept, and only a constant and a first-order (linear) term are included. Sometimes, the aforementioned is referred to as a "linear equation of two variables," with y and x serving as the variables.

Given, Seth owns a printing shop that makes customized T-shirts.

Since The cost to make T-shirts is proportional to the number of T-shirts he makes.

Thus,

The y-intercept of the line will be 0 cause the line is passing through the origin point.

The general formula of the equation of a line:

y=mx+b,

where m is the slope

b is the y-intercept

since, slope = (y - y')/(x -x')

In our case,

b = 0

m = (8 - 4)(2-1)

m = 4

And m represents The cost is $4 per T-shirt.

therefore,  the slope of the line means in this situation "a. The cost is $4 per T-shirt".

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Physics shows that when an object is thrown upward with an initial velocity of v_0, then its approximate height is given by this quadratic function.

s = -4.9t^2 + v_0^t + h

A ball is thrown upward from the top of a building 15 meters high, at a velocity of 3.1m/sec. Answer the following questions. Be sure to show and explain all work.

A. Find the maximum height and the time in which it was attained (round to 3 decimal places)

B. When does it reach the ground? (round to 3 decimal places)

C. Sketch a graph to illustrate your answers.

Answers

The answers to each part is given above.

Explain Maxima and Minima in mathematics?Maxima and Minima are known as the extrema of a function. Maxima and minima are the maximum or the minimum value of a function within the given set of ranges. For the function, under the entire range, the maximum value of the function is known as the absolute maxima and the minimum value is known as the absolute minima.Local Maxima : A point x = b is a point of local maximum for f(x) if in the neighborhood of b i.e in (b−, b+) where can be made arbitrarily small, f(x) < f(b) for all x ∈ (b−, b+)∖{b}. This simply means that if we consider a small region (interval) around x = b, f(b) should be the maximum in that interval.Local Minima : A point x = a is a point of local minimum for f(x) if in the neighbourhood of a, i.e. in (a−,a+), (where can have arbitrarily small values), f(x) > f(a) for all x ∈ (a−,a+)∖{a}. This means that if we consider a small interval around x = a, f(a) should be the minimum in that interval.

Given is that when an object is thrown upward with an initial velocity of v{0}, then its approximate height is given by this quadratic function -

S = - 4.9t² + [tex]$v_{o} ^{t}[/tex] + h

The approximate height is given by this quadratic function -

S = - 4.9t² + [tex]$v_{o} ^{t}[/tex] + h

{ 1 } - For the maximum height :

dS/dt = 0                                        ... Eq{ 1 }

dS/dt = -9.8t + [tex]$3.1^{t}[/tex] log(3.1) + 0 = 0

- 9.8t + [tex]$3.1^{t}[/tex] log(3.1) = 0

Refer to the graph attached. At t = 3.8 {possible value}, the function is 0.

So we get -

t = 3.8 s                                         ... Eq{ 2 }  

Maximum height achieved -

h{max} = - 9.8t + [tex]$3.1^{t}[/tex] log(3.1) + 15

h{max} = - 9.8 x 3.8 + [tex]$3.1^{3.8}[/tex] log(3.1) + 15

h{max} =  - 37.24 + 73.65 x 0.50 + 15

h{max} =  14.585 m

{ 2 } -

0 = 3.1 t + 9.8/2 t²

0 = 3.1 t + 4.9 t²

Solving graphically, we get -

|t| = 0.6 s

Total time taken to reach ground -

T = 2 x 3.8 + 0.6

T = 8.2 seconds                                       ... Eq{ 3 }

Therefore, the answers to each part is given above.

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Julie purchased a bottle of vegetable oil for $4.58. The cashier gave Julie $2.82 in change. How much money did Julie give the cashier?

Answers

Answer:

7.40

Step-by-step explanation:

4.58+2.82 = 7.40

Reid found 6 coins that totaled 61c in all. What coins did the find?

Answers

Answer:

1 quarter, 3 dimes, 1 nickel, 1 penny

Step-by-step explanation:

25c + 10c+10c+10c+5c+1c =61c

12x - 3у = -3

6x + y = 1

Use elimination
Pls hurry I need it now

Answers

The solution of the system of equations is (0, 1).

How to solve the system of equations?

Here we want to solve the system of equations:

12x - 3y  = -3

6x + y = 1

To use the elimination method, we can take the difference between the first equation and two times the second one, then we will get:

12x - 3y - 2*(6x + y) = -3 - 2*1

12x - 3y - 12x - 2y = -5

-5y = -5

y = -5/-5 = 1

Now we know the value of y, we can replace it in one of the equations ot find the value of x.

6x + y = 1

6x + 1 = 1

6x =  1 - 1 = 0

x = 0

The solution is (0, 1)

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8/10 of 3/9 is what?

From IXL

Answers

Answer:

7/15

Step-by-step explanation:

what is the correlation between the amount of rain (mm) in the summer and the amount of water (m2) used for watering the lawn

Answers

The correlation between the amount of rain (mm) in the summer and the amount of water (m2) used for watering the lawn is directly proportion to each other

The classification of rain

Based on the grain size, the classification of rain is divided into four, namely:

Drizzle is a small amount of rain precipitation that can even be called light, which generally has a diameter of less than 0.5 mm. Drizzle is caused by small stratus clouds and stratocumulus clouds. Snowfall or snow is rain from small crystals of water that turn into ice and have temperatures below freezing. Hail hailstones are ice cubes that fall from clouds that have temperatures below 0° degrees Celsius which occur in hot weather Heavy rain  is an outpouring of water that has grains of approximately 7 millimeters and comes from clouds that have temperatures above 0°.

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Help pic is included y(x^2+1)=1

Answers

Answer:

C.

Step-by-step explanation:

The answer is C (-1, 1/2)

Which of these numbers is NOT divisible by 3?

300

321

241

8.910

Answers

Answer: 241

300 / 3 = 100

321 / 3 = 107

241 / 3 = 80.333

8.910 / 3 = 2.97

Answer is 241, hope this helps

An amount is divided among A, B and
C in the ratio 2:5:7 respectively. B
gets R30.
How much does A get?​

Answers

On solving the provided question, we can say that ratio is = 2:5:7 => 2x + 5x + 7x = 84 => x =  6 and A gets = 2x = 12 rs.

what is ratio?

Ratios show how often one number is contained in another in mathematics. For instance, the ratio of oranges to lemons in a fruit dish is 8 to 6 if there are 8 oranges and 6 lemons present. In a similar vein, the proportion of oranges to whole fruit is 8, while that of lemons to oranges is 6:8. A ratio is an ordered pair of numbers a and b that is expressed as a / b, with b not equal to zero. An equation equating two ratios is known as a ratio. The ratio can be expressed as 1:3, for instance, if there is 1 boy and 3 girls (for every boy she has 3 girls) 3/4 are girls, while 1/4 are boys.

ratio is = 2:5:7

2x + 5x + 7x = 84

14x = 84

x = 84/14 = 6

a gets = 2x = 12 rs.

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Choose the justification for each step in the solution to the given equation.
- division property of equality
- simplification
- multiplication property of equality
-Addition property of equality
-Subtraction property of equality

Answers

The properties are used to manipulate equations in order to isolate a variable, find a solution, or simplify the equation

What are the properties of equality?

The "division property of equality" states that if you divide both sides of an equation by the same non-zero number, the two sides will remain equal.

The "simplification" step is used to simplify an expression by combining like terms, reducing fractions, or performing other operations to simplify the expression.

The "multiplication property of equality" states that if you multiply both sides of an equation by the same non-zero number, the two sides will remain equal.

The "addition property of equality" states that if you add the same number to both sides of an equation, the two sides will remain equal.

The "subtraction property of equality" states that if you subtract the same number from both sides of an equation, the two sides will remain equal.

These properties are used to manipulate equations in order to isolate a variable, find a solution, or simplify the equation.

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Write a story problem that can be solved using 1 3/4 / 1/2. Drraw a picture to match your story and Illustrate the answer.

Answers

Answer: A baker needs to make a dessert for a party. The recipe calls for 1 3/4 cups of sugar, but the baker only has 1/2 cup measuring cups. How many measuring cups does the baker need to measure out the sugar for the recipe?

We can start by converting the mixed number 1 3/4 into an improper fraction: 1 3/4 = 7/4. Then, we can divide 7/4 by 1/2:

7/4 ÷ 1/2 = 7/4 * 2/1 = 14/4 = 3 1/4

The baker needs 3 1/4 measuring cups to measure out the sugar for the recipe.

[Image: Three and a quarter measuring cups filled with sugar]

Step-by-step explanation:

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Jamilas mom wants to make a size 10 dress and jacket. About how much yards of fabric does she need?

Answers

Answer:

[tex]2\frac{7}{8}[/tex]

Step-by-step explanation:

size 10 dress requires 2 1/4 yards of fabric while a jacket requires 1 5/8 yards so we add them

2 1/4+1 5/8

we make similar fractions and turn the denominator to 8

2 2/8+ 1 5/8

and now we can add the whole numbers first

2+1=3

now the fractions

2/8+5/8

7/8

final answer is 2 7/8

hopes this helps

3. Determine the cost to lay down pebbel in the seating area one bag of pebbels covers 5 ft² and costs $8.99​​

Answers

The total amount to lay down the pebbles in the seating area would be - ${(A/5) x 8.99}.

What are algebraic expressions?In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context.Mathematical symbols can designate numbers (constants), variables, operations, functions, brackets, punctuation, and grouping to help determine order of operations and other aspects of logical syntax.

Given is that one bag of pebbles covers 5 ft² and costs $8.99​​.

Assume that the area of the seating place is A ft². Now -

1 bag will cover - 5 ft²

1 ft² will be covered in (1/5) bags

A ft² will be covered in (A/5) bags

The total cost of laying the pebbles -

(A/5) x 8.99

Therefore, the total amount to lay down the pebbles in the seating area would be - ${(A/5) x 8.99}.

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Find the equation of the line through the point (7,-9) with slope -5/7 The equation is (Be sure to enter your answer as an equation)

Answers

Required  the equation of the line is y = -5/7 *x -4.

What is a straight line?

A straight line is an endless one-dimensional figure that has no width. It is a combination of endless points joined both sides of a point and has no curve.

here, we have,

the line through the point (7,-9) with slope -5/7

so, m= -5/7

now, y= mx+c

solving with the given values we get,

c=  -9 +5

 = -4

Hence, Required  the equation of the line is y = -5/7 *x -4.

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Select the correct answer.
Where does the graph of y= sin x from x = 0 to x = 277 start?
OA.
OB.
O C.
O D.
at its minimum
at an x-intercept
at its maximum
between an x-intercept and its maximum

Answers

Answer:

At an x-intercept

Step-by-step explanation:

y = sin x

y = sin 0

y = 0

(0,0) is an x-intercept but not it's maximum or minimum.

If the terminal side of angle A goes through the point (−24/25,7/25) on the unit circle, then what is sin(A)?

Answers

The value of sin A is, 7/25.

What is Circle?

The circle is a closed two dimensional figure , in which the set of all points is equidistance from the center.

We have to given that;

The terminal side of angle A goes through the point (−24/25,7/25) on the unit circle.

Now, By definition we get;

⇒ cos A = - 24/25

⇒ Sin A = 7/25

Thus, The value of sin A is, 7/25.

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