Answer:
Abackyard = (3w + 5)2
Apool = w(w + 10)
Asurround = (3w + 5)2 - w(w + 10)
A=8w2+20w+25
D
Step-by-step explanation:
f(x) =x(x-9)
X(x-9)=0
X2-9x=0
X2-9x+0=0
(X2-9X)
x(x-9)=0
X-9=0
X=9
X+0=0
X=0
3x = 36
4k+5a_3=10_2k
4k+2k+5a=10+3
6k+5a=13