A hemisphere-shaped dome of radius 70 ft is to be coated with a layer of rust-proofer before painting. Use differentials to estimate the amount of rust-proofer needed if the coat is to be 0.03 in. thick.
?
Hint: The volume of a hemisphere of radius r is 
.
?
A. 76.97 ft3
B. ?76.54 ft3
C. ?77.54 ft3
D. ?76.78 ft3
Answer: A
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A. y = 2x + 4
B. y = 
- 4
C. y = 2x - 4
D. y = 
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