B. 2 Points determine a unique line
Answer:
a: 
Step-by-step explanation:
9+7=16 and 5+8=13
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286 feet; use the numbers and find the area of each rectangle, then add them all together.
Wa=0.5Wb, Ha=20, Hb is unkown
the area of rectangle a is : Wa*20
the area of rectangle b is : Wb*Hb
Rectangle a has 7 times the area of rectangle b: Wa*20=7*Wb*Hb
Replace Wa with 0.5Wb: 0.5Wb*20=7Wb*Hb => Hb=10/7
