Answer:
a+b = 4
Step-by-step explanation:
3(a + b)^2 = 81
(a + b)^2 = 27
a + b = sq rt 27
a + b =
· 
a + b = 3
X^2 + 9 + 7 = 20
X^2 +16 = 20
X^2 = 20-16
X^2 = 4
Root 4 = 2
X=2
1/4 divided by 2 is the answer
A = 225 in^2
W = 13.75
15x16 = 240 in^2
240/13.75 = 17.45 in
the mirror would not fit in a space that is 15 by 16 inches since its approximately 13 by 17 inches