Answer:
a = b = 1
Step-by-step explanation:
The triangles are similar thus ratios of corresponding sides are equal, that is
= ( cross- multiply )
10b = 10 ( divide both sides by 10 )
b = 1
and
10a = 10 ( divide both sides by 10 )
a = 1
Thus a = 1 and b = 1
Answer: -12.5%
72 + 56 = 128
72 x / 128 x 100 = 56.25
56 / 128 x 100 = 43.75
43.75 - 56.25 = - 12.5
-16x+4
-6x+2/3(9-15x)-2
Distribute
-6x +2/3 *9 +2/3*(-15x) -2
-6x +6 -10x -2
Combine like terms
-6x-10x +6-2
400
B