What is the set solution for |y-9|≤12?
A. y≥3 or y≤21
B. -3≤y≤21
C. y≥-3 or y≤21
D. 3≤y≤21

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7

students group

step-by-step explanation:

a person who   joins a party or a seminar can explain his feelings about that particular occasion better more than anyone else.

as bella managed a show for the students in the school and invited students to watch that show

hence

students group will be the best group to survey to find this information