Find the constant of proportionality k, and write the linear function relating the two variables.Suppose that y is directly proportional to x. When x = 12, then y = 2.
A. k = 10; y = x + 10
B. k = 
; y = 
x
C. k = 6; y = 6x
D. k = 
; y = 
x
Answer: D
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Use the figure to answer the question.Marriage Licenses Issued (Each circle represents 20,000 licenses)
How many more licenses are issued in June than in July?
A. 40,000 B. 70,000 C. 30,000 D. 50,000
Find the derivative of the function.
?
?
A. 
B. 
C. 
D. 
Solve the problem.In one U.S. city, the quadratic function 
models the median, or average, age, y, at which men were first married x years after 1900. In which year was this average age at a minimum? (Round to the nearest year.) What was the average age at first marriage for that year? (Round to the nearest tenth.)
A. 1961, 23.5 years old B. 1961, 50.4 years old C. 1953, 36 years old D. 1936, 50.4 years old
Find the following using a calculator. Round to four decimal places.log 82
A. 1.9138 B. 4.9067 C. 4.4067 D. 1.4138