The sum of a and b is -10. the difference between a and b is 4. the product of a b and c is 40. work out the value of c.

With the data we have, we have to

A + B = - 10

A - B = 4

A . B . C = 40

We want the value of C. This is

Isolate A

A = - 10 - B

Replaces in A - B = 40, have to

- 10 - B - B = 4

- 2 B = 14

B = - 7

Replaces B

A = - 10 - ( - 7 )

A = - 10 + 7

A = - 3

like this

- 7 . ( - 3 ) . C = 40

21 . C = 40

C = 40 / 21

Hope that is helps, good studies.

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.