3(4a+7)=5(2a+4)+1 what is it??

a = 0

Step-by-step explanation:

I moved all terms to the left:

3(4a+7)-(5(2a+4)+1)=0

I multiplied parentheses

12a-(5(2a+4)+1)+21=0

I calculated the terms in parentheses: -(5(2a+4)+1), so:

5(2a+4)+1

I multiplied parentheses

10a+20+1

I added all the numbers together, and all the variables

10a+21

Back to the equation:

-(10a+21)

I got rid of parentheses

12a-10a-21+21=0

I added all the numbers together, and all the variables

2a=0

a=0/2

a=0

Hope this is the answer you are looking for

b. y = 4x - 2

step-by-step explanation:

to find a parallel equation to an equation, make sure both equations have the same slope but different y-intercepts.

y = 4x + 1

4 = slope

1 = y-intercept

y = 4x - 2

4 = slope

-2 = y-intercept

they both have the same slope but different y-intercepts, so, b. is the correct answer.

and to check your work, you can graph both equations. : )

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.