Solve the problem.The area A(r) = ?r2 of a circular oil spill changes with the radius. At what rate does the area change with respect to the radius when 
A. 20 ft2/ft
B. 20? ft2/ft
C. 100? ft2/ft
D. 10? ft2/ft
Answer: B
Mathematics
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Solve the problem.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 160 seconds are required to make a 
enlargement, find the time required for a 
enlargement.
A. 504 sec B. 448 sec C. 392 sec D. 560 sec
Mathematics
Solve the problem.What is the additive inverse of 7 ?
A. 
B. - 7
C. - 
D. 0
Mathematics
Find the opposite, or additive inverse.Find -(-x) when x is 267.
A. -534 B. 267 C. -267 D. 266
Mathematics
Multiply.(x + 
y)(x - 
y)
A. x2 - 
y2
B. x2 - 4xy - 9y2
C. x2 - 4y2
D. x2 + 4xy - 9y2
Mathematics