John's age is 4 more than 3 time mike's age. if their sum is 20, how old are mike and john?

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction

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.