Plssss I need help with this math thing

Answer:

The cost of the car with sales tax would be $23,406.38.

Step-by-step explanation:

You can calculate this by adding the sales tax to the cost of the car:

$21,500 * 8.25% = $1,786.25

$21,500 + $1,786.25 = $23,286.25

The amount invested at each rate of 2% and 7% respectively is $12000 and $2000

Simultaneous equations are two or more algebraic equations that share variables e.g. x and y . They are called simultaneous equations because the equations are solved at the same time. For example, below are some simultaneous equations: 2x + 4y = 14 4x − 4y = 4.

Represent the amount invested at 2% by x and the amount invested at 7% by y

therefore x+y = 14000 equation 1

2x/100 + 7y/100 = 380

multiply through by 100

2x + 7y = 38000 equation 2

using elimination method

2x + 2y = 28000 equation 3

2x + 7y = 38000 equation 4

subtract equation 3 from 4

5y = 10000

divide both sides by 5

y = 10000/5

y = $2000

substitute 2000 for y in equation 1

x+2000 = 14000

x = 14000-2000

x = $12000

therefore the amount invested at 2% rate is $12000 and at 7% rate is $2000

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The x-intercepts of the quadratic function can be found by setting y to 0 and solving for x. The x-intercepts are -9, -3.5 and 3.5

The line of symmetry of a quadratic function, represented by the equation y = ax^2 + bx + c, is x = -b/(2a).

Since the line of symmetry of the given function is x = -3.5, we have -b/(2a) = -3.5, so b/(2a) = 3.5.

The zeros of a quadratic function are given by the solutions of the equation y = 0, which is equivalent to ax^2 + bx + c = 0.

Since the function has a zero at x = -9, the equation becomes -9 = -9a^2 - 9b + c, or 9a^2 + 9b - c = 0.

We can use the equation b/(2a) = 3.5 to find a in terms of b, which can then be used to solve for c.

Substituting b/(2a) = 3.5 into 9a^2 + 9b - c = 0 gives us 9a^2 + 9(2a * 3.5) - c = 0.

Simplifying the right-hand side gives us 9a^2 + 63a - c = 0.

So, c = 9a^2 + 63a.

The x-intercepts are given by the solutions of the equation ax^2 + bx + c = 0, so to find them, we can substitute the values of a, b, and c into this equation.

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The required average mark for a one-hour exam is given as 81, as per the given condition.  

The average of the values is the ratio of the total sum of values to the number of values.

To find the student's grade, we need to calculate the average of all the exams. The total number of 1-hour exams is 4 + 2 = 6, so the total number of hours of exams is 6 * 1 hour = 6 hours.

First, we find the average of the four 1-hour exams: (63 + 78 + 95 + 90) ÷ 4 = 316 ÷ 4 = 79.

Next, we add the final exam grade, which counts as two 1-hour exams, to find the total number of exam points: 79 * 4 + 85 * 2 = 316 + 170 = 486.

Finally, we divide the total number of points by the total number of hours of exams to find the average exam grade: 486 ÷ 6 = 81.

So, the student's average exam grade is 81.

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The correct equation for the graph include the following: C. y = 2x/3 - 4.

Mathematically, the point-slope form of a straight line can be calculated by using this mathematical expression:

y - y₁ = m(x - x₁) or y - y₁ = (y₂ - y₁)/(x₂ - x₁)(x - x₁)

Where:

From the information provided above, we have the following slope and data points on the line:

At point (0, -4), a linear equation of this line can be calculated in slope-intercept form as follows:

y - y₁ = (y₂ - y₁)/(x₂ - x₁)(x - x₁)

y - (-4) = (0 + 4)/(6 - 0)(x - 0)

y + 4 = 2x/3

y = 2x/3 - 4

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The table for the number of steps Anne walked in x hours is:

Hours    Steps

1             700

2            1400

3            2100

Anne walked more than Elyse for different numbers of hours.

A function is a relationship between inputs where each input is related to exactly one output.

Example:

f(x) = 2x + 1

f(1) = 2 + 1 = 3

f(2) = 2 x 2 + 1 = 4 + 1 = 5

The outputs of the functions are 3 and 5

The inputs of the function are 1 and 2.

We have,

Anne function:

y = 700x

Now,

The table for the number of steps Anne walked in x hours.

Hours    Steps

1             700

2            1400

3            2100

Now,

Anne has walked more than Elyse for different numbers of hours.

Thus,

The table comparison is given above.

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The value of fractions after subtraction is,

⇒ - (y² - 10y - 12) / (y - 4) × 1 / (y + 2)

A fraction is a part of whole number, and a way to split up a number into equal parts. Or, A number which is expressed as a quotient is called fraction. It can be written as the form of p : q, which is equivalent to p / q.

We have to given that;

⇒ y/ (y + 2) is subtracted from 6 / (y - 4).

Now, We can subtract as;

⇒ 6 / (y - 4) - y / (y + 2)

⇒ 6 (y + 2) - y (y - 4) / (y - 4) (y + 2)

⇒ (6y + 12 - y² + 4y) / (y - 4) (y + 2)

⇒ (- y² + 10y + 12) / (y - 4) (y + 2)

⇒ - (y² - 10y - 12) / (y - 4) (y + 2)

⇒ - (y² - 10y - 12) / (y - 4) (y + 2)

⇒ - (y² - 10y - 12) / (y - 4) × 1 / (y + 2)

Thus, The value of fractions after subtraction is,

⇒ - (y² - 10y - 12) / (y - 4) × 1 / (y + 2)

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Answer:

Step-by-step explanation:

The number of students should be in the class should be considered as the 36.

Calculation of the number of students:

Since

there are between 25 and 43 students in a class

the ratio of boys to girls is 5 : 7

So here the total ratio should be like

= 5 + 7

= 12

So here the number of students should be divisible by 12

So, it should be 36

The speed of the train in miles per hour is equal to 120 miles per hour.

In Mathematics, speed can be defined as the distance covered by a physical object per unit of time. This ultimately implies that, speed can be measured by using this unit of measurement;

Mathematically, the speed of this train can be calculated by using this formula;

Speed = total distance/time

Speed = (450 + 270)/6

Speed = 720/6

Speed = 120 miles per hour.

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Answer: We will do (A) then you will be able to do most of them

Step-by-step explanation: For (A) first write it down

18x - 2y=0

Now we can explore many different combinations but I will give you something simple

18(1) - 2(9)=0  (note that two numbers beside each other means multiplication)

Now we can see this is now = 18 - 18 = 0

The exact value of θ can not be expressed in terms of elementary functions and is difficult to find without numerical methods.

To find the angle of intersection between two curves, we need to find the dot product of the two vectors that represent their tangent lines at the intersection point.

Let's find the first derivative of both r1(t) and r2(t) with respect to t:

r1'(t) = -sint i + cost j + k

r2'(t) = i + 2tj + 3t^2 k

The tangent lines at (1,0,0) are given by:

r1'(1) = -sin(1) i + cos(1) j + k

r2'(1) = i + 2j + 3k

The angle of intersection between these two lines is given by the dot product of the two vectors divided by the product of their magnitudes:

cos(θ) = (r1'(1) * r2'(1)) / (||r1'(1)|| * ||r2'(1)||)

= (-sin(1)i + cos(1)j + k) * (i + 2j + 3k) / (||-sin(1)i + cos(1)j + k|| * ||i + 2j + 3k||)

To find the angle of intersection, we can use the arccosine function:

θ = arccos(cos(θ))

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The two expressions are equivalent is equal to 2y+19.

Addition is a way of combining things and counting them together as one large group. ... Addition in math is a process of combining two or more numbers.

here, we have,

(y+10)+y+9

⇒ y+y+10+9

⇒2y+19

using addition we get this.

now, we have,

and 2 (y+7)+5

⇒2y +14+5

⇒2y+19

using  multiplication & then addition , we get, this.

Hence, the two expressions are equivalent is equal to 2y+19.

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The simplified form of the expression is 2/3x-1+2(x-6)​ is 8x/3 -13.

Bracket, Of, Division, Multiplication, Addition, and Subtraction is referred to as BODMAS. A mathematical expression's order of execution is explained using the BODMAS. The acronym PEDMAS, which stands for Parentheses, Exponents, Division, Multiplication, Addition, and Subtraction, is sometimes used to refer to the BODMAS.

The brackets must be solved first, then powers or roots (i.e. of), Division, Multiplication, Addition, and finally Subtraction, according to BODMAS rule. Any expression can only be solved correctly if the BODMAS rule or the PEDMAS rule are applied.

The given expression is: 2/3x-1+2(x-6)​

2/3x-1+2(x-6)​

2/3x - 1 + 2x - 12

2/3x - 1 + 6x/3 -12

8x/3 -13

Hence the simplified form of 2/3x-1+2(x-6)​ is 8x/3 -13.

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Answer:

No, because 234 / 36 is 6.5 which is what Chad makes hourly. 288 / 40 is 7.2 which is what Geo makes hourly so it is not proportional.

Answer:

see  below

Step-by-step explanation:

Chad earns $234 for 36 hours of work.  so 234/36 = 6.5/hr

Geo earns $288 for 40 hours of work. so 7.2/hr

No they are not because their hourly rates are different.  

The answers to each part is mentioned above.

Given is the term -

Accompanying percentiles

The kth percentile of a set of data is a value such that {k} percent of the observations are less than or equal to the value.

10% of​ 3- to​ 5-month-old males have a head circumference that is 41.0 cm or less.

90​% of​ 2-year-old females have a waist circumference that is 52.7 cm or less.

At each​ percentile, the heights generally decrease as the age increases. Assuming that an adult male does not grow after age​ 20, the percentiles imply that adults born in 1990 are generally taller than adults who were born in 1950.

Therefore, the answers to each part is mentioned above.

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The expression that can be used to find the area of the shaded portion will be C. 2/3 × 9² × π

The area of a shape simply means the total space that is taken by the shape. It simply expresses the extent of the region on a particular plane as well as a curved surface.

In this situation, the circle has a radius of 9 inches and is divided into 6 equal parts. the area of a single section of the circle is equal to 13.5(pie) square inches.

The expression that can be used to find the area of the shaded portion will be:

= 4/6 × πr²

= 4/6 × 9² × π

= 2/3 × 9² × π

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Answer:

-1

Step-by-step explanation:

Both approaches -1.

If Hiba needs 40g of sugar to make 15 biscuits. The amount of flour she needs is 480g and the number of packs of butter will she have to buy is 3 pack of butter.

a. Amount of flour she needs

Amount of flour she needs =(3×40) × 60/15

Amount of flour she needs = 120 × 60/15

Amount of flour she needs = 480g

b.  Packs of butter will she have to buy

Packs of butter needed = [(2×40) × 60/15] /125g

Packs of butter needed = [80 × 60/15] /125g

Packs of butter needed = 320 /125g

Packs of butter needed = 2.56

Packs of butter needed = 3 packs (Approximately)

Therefore the amount of flour she needs is 480g and the number of packs of butter will she have to buy is 3 pack of butter.

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Answer: (a) The probability that all three have type B+ blood is (0.11) * (0.11) * (0.11) = 0.001331 = 0.1331% (rounded to six decimal places).

(b) Find the probability that exactly two of the three have type B+ blood.

The probability that exactly two of the three have type B+ blood can be found using the formula for combinations: C(3,2) * (0.11)^2 * (0.89)^1, where C(3,2) represents the number of ways to choose 2 people out of 3, (0.11)^2 is the probability of both of those people having type B+ blood, and (0.89)^1 is the probability of the third person not having type B+ blood. So, C(3,2) * (0.11)^2 * (0.89)^1 = 3 * 0.11^2 * 0.89 = 0.3027 (rounded to four decimal places).

(c) Find the probability that exactly one of the three has type B+ blood.

The probability that exactly one of the three has type B+ blood can be found using the formula for combinations: C(3,1) * (0.11)^1 * (0.89)^2, where C(3,1) represents the number of ways to choose 1 person out of 3, (0.11)^1 is the probability of that person having type B+ blood, and (0.89)^2 is the probability of the other two people not having type B+ blood. So, C(3,1) * (0.11)^1 * (0.89)^2 = 3 * 0.11 * 0.89^2 = 0.2613 (rounded to four decimal places).

(d) Find the probability that none of the three has type B+ blood.

The probability that none of the three has type B+ blood is (0.89)^3 = 0.696731 = 69.6731% (rounded to four decimal places).

Step-by-step explanation:

Answer:

1. mean: 51.68, median: 51

2. 100 numbers (n represents how many numbers are in the set)

3. Interquartile range: 54 (subtract Q1 from Q3)

Step-by-step explanation:

since you don't show us f(x) here, I can only tell you in general :

when you are asked for something like f(2), it means that x = 2, and that you have to replace all "x" in the f(x) definition by "2". and then you take the calculator, if necessary, and calculate.

Yes, we can fit four (2 in x 2 in x 2 in) cubes inside a sphere with a diameter of 4 inches.

Given are four 2 in x 2 in x 2 in cubes and a sphere with a diameter of 4 inches.

The cubes can fit if -

V{cubes} < V{sphere}

{4 x a³} < {4/3πr³}

{4 x 8} < {4/3 x 3.14 x 8}

32 < 33.49

which is true

Therefore, Yes, we can fit four (2 in x 2 in x 2 in) cubes inside a sphere with a diameter of 4 inches.

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D -3/2 is the right answer. In other words, the sum of their slopes is -1. So, if the green line has a slope of 2/3, the red line has a slope of -3/2.

The slope of a line indicates its steepness. Slope is computed mathematically as "rise over run" (change in y divided by change in x). The slope of a line is its steepness as it goes from LEFT to RIGHT. Slope is the ratio of a line's rise, or vertical change, to its run, or horizontal change. The slope of a line is always constant (it never changes) regardless of whatever two locations on the line are chosen. The slope-intercept form of an equation occurs when the equation of a line is stated in the form y = mx + b. The slope of the line is given by m.

Here,

The correct answer is D -3/2 that is, the product of their slopes is -1. So, if the slope of the green line is 2/3, then the slope of the red line is -3/2.

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The suitable inequalities that can shown the shaded region are

2x-y≤0 and 2x-4y≤0

Inequality can be viewed from different perspectives, all of which are related. Most common metric is Income Inequality, which refers to the extent to which income is evenly distributed within a population.

From the graph, the first line cuts the x-axis at point 2 and touches the y-axis at -1

This forms the inequality 2x-y≤0 and

the second graph/line cuts the x-axis at point 2 and the y-axis at point -4 making the inequality 2x-4y≤0

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Check the picture below.

so hmmm let's firstly convert the angles to degrees only.

so there are 60 minutes in 1 degree, so 10' is really 10/60 = 1/6 of a degree, so 112°10' is really just 112 and 1/6 degrees.

15°20' is just well, 20/60 = 1/3, so that converted to degrees only will be 15 and 1/3 degrees.

now, a triangle has a total of 180° interior angles, so let's get the angle A

[tex]\stackrel{mixed}{112\frac{1}{6}}\implies \cfrac{112\cdot 6+1}{6}\implies \stackrel{improper}{\cfrac{673}{6}} ~\hfill \stackrel{mixed}{15\frac{1}{3}} \implies \cfrac{15\cdot 3+1}{3} \implies \stackrel{improper}{\cfrac{46}{3}} \\\\[-0.35em] ~\dotfill\\\\ 180-\cfrac{673}{6}-\cfrac{46}{3}\implies \cfrac{105}{2}\implies 52.5^o\impliedby \measuredangle A \\\\[-0.35em] \rule{34em}{0.25pt}[/tex]

[tex]\textit{Law of sines} \\\\ \cfrac{sin(\measuredangle A)}{a}=\cfrac{sin(\measuredangle B)}{b}=\cfrac{sin(\measuredangle C)}{c} \\\\[-0.35em] ~\dotfill\\\\ \cfrac{\sin(C)}{c}=\cfrac{\sin(A)}{a}\implies \cfrac{\sin(\frac{46}{3}^o)}{c}=\cfrac{\sin(52.5^o)}{354}\implies \cfrac{\sin(\frac{46}{3}^o)}{\sin(52.5^o)}=\cfrac{c}{354} \\\\\\ \cfrac{354\sin(\frac{46}{3}^o)}{\sin(52.5^o)}=c\implies 117.99^o\approx c=AB[/tex]

Make sure your calculator is in Degree mode.

The number of classes who took test are 12.

A division is a process of splitting a specific amount into equal parts.

Given that Junior high classes of 20 students each met in the cafeteria to take achievement tests.

Exactly 8 students sat at each table and 30 tables were used,

We have to find the number of classes who took the tests.

8 students sat at each table and 30 tables were used then 30×8 students were sitting =240 students.      

Every class is made of 20 students so to know how many classes took the test make 240/20  which gives you 12 classes

Hence, the number of classes who took test are 12.

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15/4 or 3 3/4 or 3.75

5 * 1 3/4 = 35/4 = 8 3/4 = 8.75

hope this helps! :)