Solve.In a distant galaxy the gravity of planet A is 217 times as strong as the gravity of planet B, so objects on planet A weigh 217 times as much as they weigh on planet B. If the object weighs 
on planet A, how much does it weigh on plant B?
A. 159 lb.
B. 1660 lb.
C. 176 lb.
D. 166 lb.
Answer: D
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Answer the question.What does the digit 7 mean in the number 189,247?
A. 7 thousands B. 7 ones C. 7 hundreds D. 7 tens
Find the domain of the square root function. Then use the domain to choose the correct graph of the function.f(x) = 
A. domain of f: [4, ?)
B. domain of f: [-4, ?)
C. domain of f: (-?, 4]
D. domain of f: (-?, -4]
The eccentricity is given of a conic section with one focus at the origin, along with the directrix corresponding to that focus. Find a polar equation for the conic section. e = 
, y = -9
A. r = 
B. r = 
C. r = 
D. r = 
Estimate the sum as indicated. Then answer the question.Estimate the following sum by first rounding to the nearest ten. Does the estimate give you reason to doubt the stated sum?
A. Estimate: 1140 ; no B. Estimate: 1230 ; yes C. Estimate: 1160 ; no D. Estimate: 1010 ; yes