Find the sum (4d+9)+(7n-4)+(9y+5)

4d + 7n + 9y + 18

Step-by-step explanation:

Add like terms, like terms are terms that have the same variable and power, For ex: 4d and 2d are like temrs so u can add them but 4d and 4d^2 are not cause they have different power(the ^2 thing).

(4d+9)+(7n-4)+(9y+5)

add like terms

4d + 7n + 9y + 18

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1