Solve.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 80 seconds are required to make a 5-by-4 enlargement, find the time required for a 6-by-5 enlargement.
A. 120 sec
B. 90 sec
C. 150 sec
D. 180 sec
Answer: A
Mathematics
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Simplify the expression. (Remember the order of operations.)[19 - (-20)] - [18 + (-6)]
A. -23 B. 23 C. -15 D. 27
Mathematics
The function f is one-to-one. Find its inverse.f(x) = 2x
A. f-1(x) = 
B. f-1(x) = 
C. f-1(x) = -2x
D. f-1(x) = 2x
Mathematics
If 
a. 7 b. -13 c. 20 d. 6 e. 13
Mathematics
Find the least common denominator.
+ 
A. m(m + 4)(m + 2) B. (m + 4)2 C. m(m + 4)2 D. m(m + 6)(m + 2)
Mathematics