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 48 seconds are required to make a 3-by-4 enlargement, find the time required for a 7-by-10 enlargement.
A. 350 sec
B. 280 sec
C. 210 sec
D. 420 sec
Answer: B
Mathematics
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Express the given function as a composite of functions f and g such that y = f(g(x)).y = 
A. f(x) = 
, g(x) = x2 - 4
B. f(x) = 
, g(x) = - 
C. f(x) = 
, g(x) = x - 4
D. f(x) = 
, g(x) = x2 - 4
Mathematics
Factor the trinomial completely.10y2 + 45y - 25
A. (10y - 5)(y + 5) B. 5(2y + 1)(y - 5) C. 5(2y - 1)(y + 5) D. prime
Mathematics
Find the distance between the pair of points. Give an exact answer.(7, 1) and (-6, -4)
A. 194 units
B. 12 units
C. 65 units
D. 
units
Mathematics
Estimate the product by first rounding each number so that there is one nonzero digit.25.9 × 3.9
A. 12 B. 120 C. 1200 D. 12,000
Mathematics