Use the four-step procedure to solve the variation problem.A person's hair length varies directly as the number of weeks it has been growing. If Fred shaved his head bald and his hair was 0.28 inches long after 7 weeks, how long would it be after an additional 6 weeks? Round to the nearest hundredth of an inch.
A. 1.50 inches
B. 0.24 inch
C. 3.25 inches
D. 0.52 inch
Answer: D
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Test the vector field F to determine if it is conservative.F = -cos x cos yi + sin x sin yj - sec2 zk
A. Not conservative B. Conservative
Simplify. Assume that no radicands were formed by raising negative quantities to even powers.3
+ 9
A. 12
B. 84
C. 27
D. 12
Use the MACRS depreciation rates table to find the recovery percent (rate), given the recovery year and recovery period.MACRS Depreciation Rates 
Recovery year:4Recovery period:27.5 years
A. 3.636% B. 6.177% C. 3.637% D. 1.818%
Find the length of the third side of the right triangle. Assume that c represents the length of the hypotenuse. Give an exact answer and, if appropriate, an approximation to three decimal places.a = 6, b = 8
A. c = 48 B. c = 14 C. c = 10 D. c = 100