Solve.The speeds of pulleys are inversely proportional to the lengths of their diameters. The diameter of pulley A is 18 cm and the diameter of pulley B is 8 cm. If pulley B turns at 342 rpm's, how fast does pulley A turn?
A. 749.3 rpm's
B. 769.5 rpm's
C. 152 rpm's
D. 174 rpm's
Answer: C
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Choose the function that might be used as a model for the data in the scatter plot.
A. Exponential, f(x) = ab-x or f(x) = P0e-kx, k > 0
B. Logistic, f(x) = 
C. Polynomial, not quadratic
D. Logarithmic, f(x) = a + b ln x
Solve the problem.The concentration, in parts per million, of a particular drug in a patient's blood x hours after the drug is administered is given by the functionf(x) = -x4 + 13x3 - 54x2 + 84xHow many hours after the drug is administered will it be eliminated from the bloodstream.
A. 6 hours B. 19 hours C. 7 hours D. 12 hours
Solve the problem.Consider the following simplified digital photograph that has a 3 × 3 grid with four gray levels numbered from 0 to 3. It shows a letter Y in white on a black background.
Let A be the 3 × 3 matrix that represents this figure digitally. Find the matrix B for which B - A represents the negative image of the picture represented by A.
A. 
B. 
C. 
D. 
Solve the problem.The price p and the quantity x sold of a certain product obey the demand equation: 
What is the revenue to the nearest dollar when 300 units are sold?
A. $7500 B. $52,500 C. $70,000 D. $10,000