Simplify.
+ 
+ 
+ 
A. 68
+ 15
B. 
+ 
+ 15
C. 10
+ 
+ 
D. 10
+ 15
Answer: D
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A company installs 5,000 light bulbs. The lifetimes of the lightbulbs are approximately normally distributed with a mean of 500 hours and a standard deviation of 100 hours. Find the approximate number of bulbs that can be expected to last the indicated amount of time.Less than 500 hours
A. 3,000 B. 2,500 C. 1,000 D. 2,400
Evaluate the derivative.f(x) = 5 tanh-1(cos x)
A. - 
B. - 
C. - 
D. ln
sin x
Use the appropriate geometric formula from the following list to find the requested measure. 
The area of a rectangle with a length of 102 inches and a width of 17 inches
A. 1734 sq in. B. 119 sq in. C. 1724 sq in. D. 1445 sq in.
Solve the problem.If the voltage, V, in an electric circuit is held constant, the current, I, is inversely proportional to the resistance, R. If the current is 140 milliamperes (mA) when the resistance is 4 ohms, find the current when the resistance is 28 ohms.
A. 980 mA B. 80 mA C. 20 mA D. 973 mA