What is the result of substituting for y in the bottom equation? y = x + 3

y= x2 + 2x-4

A. x+ 3 = x2 + 2x - 4

B. X+ 3 = x2

C. y= (x+3)2 + 2(x + 3) - 4

D. y= x2 + 2x - 4 - (x+3)

(A)

Step-by-step explanation:

Given the equations:

Substitution simply means replacing the variable y in the second equation with its equivalent x+3 from the first equation.

Substitution of y into gives us:

The correct option is A.

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)