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 140 seconds are required to make a 5-by-4 enlargement, find the time required for a 
enlargement.
A. 270 sec
B. 210 sec
C. 240 sec
D. 180 sec
Answer: B
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Find the mean for the list of numbers.Ages of patients (in years) in a clinic: 18, 4, 25, 18Round answer to the nearest whole number if necessary.
A. 4 year(s) B. 18 years C. 16 years D. 15 years
Solve the problem.The population of a particular country was 23 million in 1981; in 1990, it was 27 million. The exponential growth function 
describes the population of this country t years after 1981. Use the fact that 9 years after 1981 the population increased by 4 million to find k to three decimal places.
A. 0.018 B. 0.154 C. 0.028 D. 0.715
Find the slope of the line passing through the points (2, 0) and (2, 6).
A. 4
B. 0
C. undefined
D. 
E. none of these
Based on the following table, find 
.
x-3-2-10123f(x)525-210.41.5?
Fill in the blank(s) with the appropriate word(s).