What do you have to add to -2 1/2 to have a result of 2 1/2

The number to add is 5

Step-by-step explanation:

Let

x ----> the number to add

we have that

Convert mixed number to an improper fraction

substitute

Solve for x

Adds 5/2 both sides

g

step-by-step explanation:

(f - g)(x) = 5x^3 - 3

step-by-step explanation:

rearrange these functions vertically, with like terms in separate columns:

f(x) = 5x^3 - 2

g(x) =         +1

now subtract, column by column:

(f - g)(x) = 5x^3 - 3