5 people take 12 hours to build a wall.
How long would it take 3 people to build the wall?

Answer:

4x - 16

Step-by-step explanation:

X can be any value (I made it 20)

5.5(2)+ 1 - (1.5(2) +17)

11 + 1 - 20

12 -20

-8

4(2) - 16

8 - 16

-8

You better say thanks (from a grade 9 academic student)

Answer:

4x-16

Step-by-step explanation:

5.5x + 1-(1,5x+17)?

When there's a - in front of an expression in parenthesis, cvhangethe sign of each term in the expression.

5.5+1-1.5x-17

Like terms

4x + 1-17

Then boom 4x-16

Answer: Step-by-step explanation:

1.  D, last one.

4. C, third one.

2. C, third one.

3. B, second one.

Answer:

c

Step-by-step explanation:

Answer:

             [tex]\bold{m=-\dfrac92=-4.5}[/tex]

Step-by-step explanation:

[tex]\bold{slope\, (m)=\dfrac{change\ in\ Y}{change\ in\ X}=\dfrac{y_2-y_1}{x_2-x_1}}[/tex]

(2, -9)    ⇒   x₁ = 2,  y₁ = -9

(-2, 9)    ⇒   x₂ = -2,  y₂ = 9

So the slope:

                    [tex]\bold{m=\dfrac{9-(-9)}{-2-2}=\dfrac{18}{-4}=-\dfrac92}[/tex]

Answer:

50m

Step-by-step explanation:

Calculation for the height of the building

First step:

Let x represent the building height

Second step:

100m/8m = x/4

Third step is to Cross multiply:

100m(4) = 8x

400m= 8x

x=400m/8

x=50m

Therefore the height of the building will be 50m

Answer:

C

Step-by-step explanation:

A is incorrect because as x goes from 0 to 1, y jumped from 0 to 4

B is incorrect because as x goes up by 2, y at first goes up by 2 but then jumped to 4.

C is correct because as x goes up by 1, y goes up by 3

D is incorrect because y jumped from 0 to 10 and first but lowered to 5 after.

Answer:

(- 1, - 3 )

Step-by-step explanation:

Given endpoints (x₁, y₁ ) and (x₂, y₂ ) partitioned in the ratio m : n

Then using the Section formula the coordinates of the point are

( [tex]\frac{nx_{1}+mx_{2} }{m+n}[/tex], [tex]\frac{ny_{1}+my_{2} }{m+n}[/tex] )

Here (x₁, y₁ ) = (- 4, - 9), (x₂, y₂ ) = (1, 1) and m : n = 3 : 2 , then

( [tex]\frac{2(-4)+3(1)}{3+2}[/tex] , [tex]\frac{2(-9)+3(1)}{3+2}[/tex] )

= ( [tex]\frac{x}{y} \frac{-8+3}{5}[/tex], [tex]\frac{-18+3}{5}[/tex] )

=  ( [tex]\frac{-5}{5}[/tex], [tex]\frac{-15}{5}[/tex] )

= ( - 1, - 3 )

Answer:

(-1 , -3)

Step-by-step explanation

For unknown reason, I can't save the explanation in this space. It's detailed in the attachment

Answer: He bought 8 quarts

Step-by-step explanation:

There are 4 quarts in a gallon so if you multiply 4 by 2 then you get 8,

Answer:

8 quarts

Step-by-step explanation:

1 gallon is equal to 4 quarts, so from there you just multiply 2 times 4 and you get 8 !

Answer: Direct Proportion

In mathematical statements, it can be expressed as y = kx. This reads as “y varies directly as x” or “y is directly proportional as x” where k is constant in the equation. Example: y is directly proportional to x, when x = 15, y = 30.

Answer:51

Step-by-step explanation:102 beats : 2 min

                                              ?beats       :1 min

               Do 102 times 1 which gives you 102 .Then divide by 2 and you get 51.

Hope it helps. :)

102 beats per 2 minutes then 51 beats per minute.

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

It is given that,

102 beats per 2 minutes

We need to calculate how many beats per minute.

To do this we just have to divide One hundred two by two

102/2

Fifty one beats.

51 beats per minute

Hence 51 beats per minute.

To learn more on Division click:

https://brainly.com/question/21416852

#SPJ2

Answer:

1/2

Step-by-step explanation:

Let the total pie be 2

She ate 1/6

Her brother ate 1/3

If she gave her Friend the remaining, the fraction of the amount her friend collected is expressed as:

1-(1/6+1/3)

= 1-((1+2)/6)

= 1-3/6

= 1 - 1/2

=1/2

Hence the fraction she gave her friend is 1/2

Answer:

Slope of the line if two points are known

Step-by-step explanation:

Formula is y2-y1/x2-x1

so that 1-(-9)/-2-(-2)

10/0 is undefined that means line is parallel to y-axis

when a line is parallel to y axis it has no slope.

- don't know what you mean, but maybe the graph?

Answer:

5, 1, 0.2

Step-by-step explanation:

Divide the number by 5 to get the next one.

Answer:

B; 4/d-6

Step-by-step explanation:

We want to perform a division here

Flipping the right hand side while changing the sign to multiplication, we have that;

(2d - 6)/ (d^2 + 2d -48) * (2d + 16)/d-3

= 2(d-3)/(d^2 + 2d - 48) * 2d + 16/d-3

= 2/(d^2 + 2d - 48) * 2d + 16/1

2/(d-6)(d + 8) * 2(d + 8)/1

= 2/d-6 * 2/1

= 4/d-6

Answer:

[tex]Volume = 7x^3y+48x^2y^2-7xy^3 -35x^2-240xy-35y^2[/tex]

Step-by-step explanation:

Given

Shape: Cube

Dimension: (x+7y), (7x-y) and (xy-5).​

Required

Determine the volume

The volume is calculated by multiplying the dimensions:

[tex]Volume = (x+7y) * (7x-y) * (xy-5)[/tex]

Evaluate the first 2 brackets

[tex]Volume = [x(7x-y)+7y(7x-y)] * (xy-5)[/tex]

[tex]Volume = [(7x^2-xy)+(49xy-7y^2)] * (xy-5)[/tex]

[tex]Volume = [7x^2-xy+49xy-7y^2] * (xy-5)[/tex]

[tex]Volume = [7x^2+48xy-7y^2] * (xy-5)[/tex]

Open brackets

[tex]Volume = xy[7x^2+48xy-7y^2] -5[7x^2+48xy-7y^2][/tex]

[tex]Volume = 7x^3y+48x^2y^2-7xy^3 -35x^2-240xy-35y^2[/tex]

Answer:

24/13 or 1.8

Step-by-step explanation:

27b -3 - 14b -21 = 0

13b - 24 = 0

13b = 24

b = 24/13 or 1.8

Answer:

B = 6

Step-by-step explanation

1. (Do the parentheses)  3(6b-1)-7(2b+3) = 18b-3-14b-21

2. (Simplify) 18b-3-14b-21 = 4b-24

3. (Add 24 to both sides) 4b-24+24=0+24

4. (Simplify) 4b = 24

5. (Divide by 4) b = 6

Answer:

a= 9/4

Step-by-step explanation:

2m^(5/2)/m^(1/4)

2m^(5/2 -1/4)

2m^(9/4)

Hope you find this helpful <3

Answer:

2). 2

3). 5

4). 3

5). 6

Step-by-step explanation:

Answer:

2.815

Step-by-step explanation:

2.8151 rounds DOWN due to the 1 being under 5.

if the last digit is 5 or above, it rounds UP.

Step-by-step explanation:

soln

given

y=2x+3 -----(i)

y=-x-9 ------(ii)

now, putting value of equation (i) in (ii)

y= -x-9

or, 2x+3 = -x-9

or, 2x+x = 9-3

or, 3x = 6

or, x = 6/3

or, x = 2

again,

y = 2x+3

or, y = 2×2+3

or, y = 7

therefore, value of X and Y are 2 and 7 respectively.

x = -1,-16,-2.

TIE FIGHTERS GO ZOOOOOOOM

Answer:

C

Step-by-step explanation:

because it is asking to find the number of classes held during the weekday zumba class.

weekday class = 30 minutes

Saturday= 45 minutes

total = 165  

Answer:

15x + 42y = $13 050

Step-by-step explanation:

hope that helped :)

1. x + 20

2. 0

3. 2x - 8

4. 95x + 10

5. -9x - 6

6. 4x + y - 5

7. -x + 6y + 5

8. x + y - 15

9. x + 4y + 4

• When working with variables and numbers, you have to put the variables first (in alphabetical order) and then the numbers.

• To evaluate an algebraic expression, we find the value of the expression when the variable is replaced by a given number.

• To evaluate an expression, we substitute the given number for the variable in the expression and then simplify the expression using the order of operations.

• When we are not given a number for the variable in the expression, we have to group like-terms.

1. 4x + 12 - 3x + 8

2. -8x + 1 + 2x - 1 + 6x

3. 4x - 3 - 2x - 5

4. 100x + 5 - 5x + 5

5. -4x - 4 - 2 - 5x

6. 2x - 1 + 2x - 4 + y

7. 5y - x + 2y - y + 5

8. -15 + 3y - 3x - 2y + 4x

9. 4 - 3y + 3x - 2x - y

Hope I helped you, if I did can you please mark me the Brainliest?

Answer:

8w-3

Step-by-step explanation:

Is that what you were looking for?

Answer:

2 groups

Step-by-step explanation:

13 times 3 is 39

39 is not 34

please mark me brainliest!!!

Answer:

D

Step-by-step explanation:

communicative property of X