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 245 seconds are required to make a 5-by-7 in. enlargement, find the time required for a 7-by-10 in. enlargement.
A. 630 seconds
B. 560 seconds
C. 420 seconds
D. 490 seconds
Answer: D
Mathematics
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Solve the problem.The area A = ?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
Mathematics
Write the ratio 136 trees on 8 acres as a fraction and simplify.
What will be an ideal response?
Mathematics
Find the volume.
A. 17
ft3
B. 60
ft3
C. 108
ft3
D. 120
ft3
Mathematics
Solve the inequality.-7(0.4)x + 33 > 5
A. x > 
B. x < 
C. x < 
D. x > 
Mathematics