Which is the factored form of -3n6 +12n4 - 6n²?

Answer:

The length of the train can be calculated using the formula:

Length of the train = Speed x Time / 2

Where,

Speed = 60 km/hr = 60 x 1000/60 = 1000 m/min

Time = 9 sec = 9 / 60 min = 0.15 min

So,

Length of the train = 1000 x 0.15 / 2 = 75 m

Therefore, the length of the train is 75 meters.

Answer:

Length of the train shold be 75m

Step-by-step explanation:

Answer:

1) 9

2) 27

3) Read explanation below!

Step-by-step explanation:

1) Use the Pythagorean theorem to find AD. Show your working

To find '?' we first have to expand the indices...

Now work out '?'

2) Find AC. Show your working

We have found out that AD is 9 and to find AC we have to add 18!

3) Is ΔABC a right triangle? Explain

We can that ΔABC is not a right angle as none of the angles in the triangle are 90°!  If it was a right angled triangle we would see the ∟sign on one of the angles. Even though there are two of those in the middle it does not count as the question is asking about ΔABC!!

Have a lovely day :)

Answer:

$2970.42

Step-by-step explanation:

Take $71,290 and divide it by 12 then you get $5,940.83 then divide that by 2 and your answer is $2,970.42

Answer: 11

Step-by-step explanation:

3x2=6

6+5=11

The ordered pair of solutions is (11/5, 2).

What is the linear equations?

A linear equation is a mathematical equation that represents a straight line when graphed on a coordinate plane. It has the form of ax + b = y, where a and b are constants and x and y are variables. The coefficient "a" determines the slope of the line, and the constant "b" determines the y-intercept.

The elimination method is a method of solving a system of linear equations by adding or subtracting the equations to eliminate one of the variables.

Here is the solution for the system of equations 2x - 2y = 2 and 5x + 2y = 12 using the elimination method:

Multiply the first equation by 5: 10x - 10y = 10

Add the two equations: 15x - 8y = 22

Solve for x by dividing both sides of the equation by 15: x = 22/15 = 11/5

Substitute the value of x back into one of the original equations to solve for y:

2x - 2y = 2

2(11/5) - 2y = 2

22/5 - 2y = 2

22/5 - 2y = 2

22/5 = 2 + 2y

22/5 - 2 = 2y

20/5 = 2y

10/5 = y

The solution to the system of equations is (x, y) = (11/5, 10/5) = (11/5, 2).

So, the ordered pair of solutions is (11/5, 2).

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The ordered pair of solutions is written in the format (x, y) is (11/5, 2) .

When plotted on a coordinate plane, a linear equation is a mathematical equation that resembles a straight line. It takes the form axe + b = y, with a and b acting as constants and x and y as variables. The line's slope is determined by the coefficient "a," whereas the y-intercept is determined by the constant "b."

A system of linear equations can be solved using the elimination approach by adding or removing equations to get rid of one of the variables.

Here is the elimination technique solution for the system of equations 2x - 2y = 2 and 5x + 2y = 12:

The first equation is multiplied by 5: 10x - 10y = 10.

Equational sum: 15x - 8y = 22

Divide both sides of the equation by 15 to find the value of x: x = 22/15 = 11/5

To find the value of y, add the value of x back into one of the initial equations:

2x - 2y = 2

2(11/5) - 2y = 2

22/5 - 2y = 2

22/5 - 2y = 2

22/5 = 2 + 2y

Simplify the equation

22/5 - 2 = 2y

20/5 = 2y

10/5 = y

The system of equations has a solution of (x, y) = (11/5, 10/5) = (11/5, 2).

The pair of answers that are in order is (11/5, 2).

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The original amount of water is 15 cups.

The change in David's water intake is 3 cups.

And, The percent change is 20%. This is a percent decrease.

A number or ratio that can be expressed as a fraction of 100 or a relative value indicating hundredth part of any quantity is called percentage.

We have to given that;

David is tracking the amount of water he drinks each day.

Here, On Thursday, he drinks 15 cups of water.

And, On Friday, he drinks 12 cups of water.

Hence, We get;

The original amount of water = 15 cups.

And, The change in David's water intake = 15 - 12

                                                               = 3 cups

And, The percent change in his water intake is,

⇒ Percent = 3 / 15 × 100

⇒ Percent = 20%

Thus, The original amount of water is 15 cups.

The change in David's water intake is 3 cups.

And, The percent change is 20%. This is a percent decrease.

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The probability that a student studied for exactly 4 hours rounded to the nearest hundredth is C. 0.26.

The concept that will be used here is probability. From the question the first column of a table serves as the amount of hours a student spent studying math,  while the  second column can be seen as the total number of pupils.

We can see from the second column's total  which is  35. We can see that just only 9 of them spent 5 hours  in the process of going over their arithmetic.

Then the likelihood that a student studied for four hours  can be known which can be calculated as :

= [9/35]

= 0.257 or 26%.

Therefore, option C is correct.

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A baker had 24 cupcakes and wanted to divide them equally among 8 friends. How many cupcakes would each friend receive?

The problem can be represented by 8/3 ÷ 4, where 8 represents the number of friends, 3 represents the number of cupcakes each friend should receive, and 4 represents the number of groups the cupcakes should be divided into.

The division makes sense because first, we need to find out how many cupcakes each friend should receive, which is 24 ÷ 8 = 3. Then, we divide the number of cupcakes each friend should receive by the number of groups to find out how many cupcakes each group should receive, which is 3 ÷ 4 = 0.75 cupcakes per group.

A scale factor consists of two or more shapes who look the same but have different scales or measures. A scale factor of 2 means that the new triangle is two times the size of the original.

If we look at shape x, we can see it has a base of 4, and a height of 3. If we also know that a scale factor of two means that the new shape will be twice as large, we can use an equation that looks like this:

(Base/height × scale factor = new base length)

Now that we have these numbers, we can take them and see which shape matches the new length.

Shape D has a base of 8 and a height of 6, meaning that it has a scale factor 2 compared to shape x.

Therefore Shape D is the answer.

Answer:

they started trip at 10:00 am

Step-by-step explanation:

Let's call the starting time "S".

The arrival time is 11:37AM,

difference in time after break to park arrived : 11:37 am - 10:48 am = 49 minutes

remaining time : 97-49= 48 minutes

starting time= 10:48 am -48 minutes = 10:00 am

The slope-intercept form of the function described by this table is y = x + 1

From the question, we have the following parameters that can be used in our computation:

x   y

0   1

From the above table of values, we can see that

The difference between the x and the y value is 1

Mathematicallly, this can be represeted as

y - x = 1

Add x to both sides

y = x + 1

The above equation is in the slope intercept form, y = mx + c

Hence, the equation is y = x + 1

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The area for each part of the figure is given as follows:

The area of a right triangle is given by half the multiplication of it's sides.

Triangle A has the side lengths given as follows:

Hence the area is given as follows:

A = 0.5 x 4 x 10 = 20 units squared.

Triangle D is has the side lengths given as follows:

Hence the area is given as follows:

D = 0.5 x 2 x 6 = 6 units squared.

The total area is given by the sum of the areas of each part of the figure, hence:

20 + 2 + 4 + 6 = 32 units squared.

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Answer:

The number with the highest sum of prime factors is 27, as it has only two prime factors: 3 and 3. The sum of its prime factors is 6, so if you choose 27, you can move 6 spaces. The number 25 has two prime factors as well, but only 5 + 5 = 10. 26 is not a prime number, so it wouldn't be the best choice. So, if you want to move as many spaces as possible, you should choose 27.

The statements that are true are:

Clayton could use the relationship (x, y) right-arrow (y, x) to find the points of the image.

Clayton could negate both the x and y values in the points to find the points of the image.

C’ will move because all points move in a reflection.

The image and the pre-image will be congruent triangles.

The image and pre-image will not have the same orientation because reflections flip figures.

Options A, B, D, E, and F.

There are two ways of reflection.

Along x-axis:

(x, y) – (x, -y)

Along y-axis:

(x, y) - (-x, y)

We have,

Clayton could use the relationship (x, y) → (y, x) to find the points of the image.

This is the y = x reflection rule.

This is true.

Clayton could negate both the x and y values in the points to find the points of the image.

Reflection of (x, y) along the x-axis and y-axis consecutively will give us

(-x, -y).

This is true.

C’ will remain in the same location as C because it is on the line of reflection.

This is not true.

C’ will move because all points move in a reflection.

This is true.

The image and the pre-image will be congruent triangles.

This is true.

The image and pre-image will not have the same orientation because reflections flip figures.

This is true.

Thus,

All statements are true except the statement:

C’ will remain in the same location as C because it is on the line of reflection.

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The number of sophomores in the class is 35.

The number of Juniors in the class is 19.

An expression is a way of writing a statement with more than two variables or numbers with operations such as addition, subtraction, multiplication, and division.

Example: 2 + 3x + 4y = 7 is an expression.

We have,

Number of sophomores = x + 16

Number of Juniors = x

Now,

Number of students in the class = 54

This means,

x + x + 16 = 54

2x + 16 = 54

2x = 54 - 16

2x = 38

x = 19

Thus,

Number of sophomores = 19 + 16 = 35

Number of Juniors = 19

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The value of cosα is 2/5.

The sides and angles of a right-angled triangle are dealt with in Trigonometry. The ratios of acute angles are called trigonometric ratios of angles. The six trigonometric ratios are sine (sin), cosine (cos), tangent (tan), cotangent (cot), cosecant (cosec), and secant (sec).

Given that, tanα= -2/5 and α is quadrant IV.

We know that, tan(−θ) = − tan(θ)

α= 2/5

As we know cos(−θ) = cos(θ)

cosα =2/5

Therefore, the value of cosα is 2/5.

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Answer:

8

Step-by-step explanation:

f(4) = 3(4) - 4

f(4) = 12 - 4

f(4) = 8

The amount that will be in the account in 25 years is $16,282.298.

Compound interest is defined as the amount of interest which has been calculated on the principal amount as well as the amount accumulated over the previous period is also included.

Given that,

Principal amount, P = $3000

Rate of interest, r = 7% = 0.07

Number of years, n = 25

The final amount in a compound interest where the interest is compounded annually is,

A = P (1 + r)ⁿ

Substituting the given values,

A = 3000 (1 + 0.07)²⁵

   = 3000 (1.07)²⁵

   = 16,282.298

Hence the final amount after 25 years is $16,282.298.

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Answer:

[tex]\text{Choice C: }\boxed{b\le 1 \dfrac{7}{10}\\\\}[/tex]

Step-by-step explanation:

We are given inequality:

[tex]\dfrac{7}{2}\ge \:b\:+\:\dfrac{9}{5}[/tex]

[tex]\cfrac{x^2 - 49}{x+2}\div \cfrac{x^2-14x+49}{3x+6}\implies \cfrac{x^2 - 49}{x+2}\cdot \cfrac{3x+6}{x^2-14x+49}[/tex]

[tex]\cfrac{\stackrel{\textit{difference of squares}}{x^2 - 7^2}}{x+2}\cdot \cfrac{3(x+2)}{(x-7)(x-7)}\implies \cfrac{~~\begin{matrix} (x-7) \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~(x+7)}{~~\begin{matrix} x+2 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~ }\cdot \cfrac{3~~\begin{matrix} (x+2) \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}{(x-7)~~\begin{matrix} (x-7) \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~} \\\\\\ \cfrac{x+7}{1}\cdot \cfrac{3}{x-7}\implies \cfrac{3(x+7)}{x-7}[/tex]

Answer:

i hope this helpes

Step-by-step explanation:

a) A group of 16 pays $40 + ($2 x (16 - 10)) = $40 + $6 = $46.

b) The cost function can be represented as C(x) = 40 + 2(x - 10) for x > 10 and C(x) = 40 for x <= 10, where x is the number of people in the group and C(x) is the cost for the group.

c) The domain of the cost function is all non-negative real numbers less than or equal to 50 (0 <= x <= 50), since the maximum group size is 50. The range of the cost function is all non-negative real numbers greater than or equal to 40 (C(x) >= 40), since the minimum charge for a group is $40.

Answer:

a) $52

b) C(x) = 40 + 2x, if x > 10 and x ≤ 50

C(x) = 40, if x ≤ 10

c) Domain = {x ≥ 1 and x ≤ 50}

Range = { from 40 to 140}

After 3 3/5 weeks, they will have the same number of pictures.

the property of having suitable proportions in terms of size, number, degree, harshness, etc.: If a defensive action against an unfair attack results in the destruction that contravenes the proportionality criterion, it may even go far beyond a justifiable defense.

Given, Yuki and Roman are photographers for the yearbook. Yuki starts with 20 photos. She then takes 60 photos each week. Roman starts with 110 photos. He then takes 35 photos each week.

Let "w" the number of weeks they collected the pictures

For Yuki,

The total picture he has after 0 weeks = is 20

The total picture he has after 1 week = 20 + 60

The total picture he has after 2 weeks = 20 + 60*2

The total picture he has after w weeks = 20 + 60*w

For Roman,

The total picture he has after 0 weeks = is 110

The total picture he has after 1 week = 110 + 35

The total picture he has after 2 weeks =110 + 35*2

The total picture he has after w weeks = 110 + 35*w

To calculate the number of weeks when they have equals pictures:

20 + 60*w = 110 + 35*w

25w = 90

w = 3 3/5

Therefore, After 3 3/5 weeks, they will have the same number of pictures.

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Answer:

0.2

Step-by-step explanation:

as 0.2 is greater than 1

Answer:

0.2

Step-by-step explanation:

The diagram = 0.1

0.1 < 0.2

The required amount invested in accounts with 8% and 12% are $1470 and $1820 respectively.

The equation model is defined as the model of the given situation in the form of an equation using variables and constants.

Here,
Lydia has money in two savings accounts one rate is 8% and the other is 12%  and the total interest is $336. Let the amount invest in accounts be x and y respectively.
According to the question,
0.08x + 0.12y = 336 - - - - - -(1)

Again,
she has $350 more in 12% account
y = x + 350 - - - - - -(2)

Put y in equation 1,
0.08x + 0.12[x + 350] =336
0.08x + 0.12x + 42 = 336
0.20x = 336 - 42
x = 294/0.20
x = $1470

Now

y = 1470 + 350
y = $1820

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The ratio of the sides = 7: 3

The ratio of perimeter = 7: 3

The ratio of the areas = 49: 9

Area of green polygon = 23

The polygons which are in the same shape but different in size are known as similar polygons. For similar polygons, the ratio of sides is known as the scale factor which is equal to the ratio of perimeters. Here the ratio of the areas is the squares of the scale factor.

Note:

Here we have two polygons

Side of the yellow polygon = 7 units

By the given formulas,

Perimeter of polygon = 6(7) = 42 units

Area of the polygon = 127 units²

Side of the green polygon = 3 units

Perimeter of polygon = 6(3) = 18 units

Area of Polygon = (3√3)/2 × (3)² = 23.383 ≅ 23

The ratio of the sides of polygons yellow to green = 7: 3

The ratio of perimeter = 42: 18 = 7: 3

The ratio of the areas = (7/3)² = 49/9

=> 49: 9

Therefore,

The ratio of the sides = 7: 3

The ratio of perimeter = 7: 3

The ratio of the areas = 49: 9

Area of green polygon = 23  

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