Answer:
formulla of perimeter of rectangle
Step-by-step explanation:
perimeter of rectangle=2(l+b)
= 2(7.5+3.25)
=2(11.25)= 22.5
f(x)=1/4(5-x)²
f(11)=1/4(5-11)²
1/4(-6)²
1/4(36)
=9