Evaluate the integral.
A. -coth 
+ C
B. 3 csch3 
+ C
C. 9 tanh 
+ C
D. 9 coth 
+ C
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.Between 540 hours and 780 hours
A. 2,215 B. 1,717 C. 2,217 D. 1,710
Simplify the expression. Assume all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Answer the question.There is an identity property for both addition and multiplication. Is there an identity property for division? If so, state the property.
A. Yes. x/1 = x B. No.
Find the value of x or y so that the line through the pair of points has the given slope.(-1, 4) and (4, y); m = 0
A. 4 B. -3 C. 3 D. -4