Solve the equation for the specified variable.A = 
h(B + b) for b
A. b = 
B. b = 
C. b = 
D. b = 2A - Bh
Answer: C
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Use identities to write each expression as a function of ?.cos (? + 90°)
A. cos ? B. -sin ? C. -cos ? D. sin ?
Use the definition of equality of complex numbers to find the real numbers x and y such that the equation is true.6 + yi = x + 
A. x = 6, y = -3 B. x = -6, y = 3 C. x = -6, y = -3 D. x = 6, y = 3
Many states conduct lotteries; a typical lottery payoff ticket is shown here. Assume there are 20 numbers chosen from a set of 80 possible numbers. What is the expectation for a five-spot game? Assume that the ticket cost $1. 5 SPOT GAMEMATCHPRIZE543$270$30$4?
A. $0.13 B. $0.26 C. - $0.13 D. $0.25 E. - $0.26
Solve the problem.At a single ticket booth, customers arrive randomly at a rate of x per hour. The average line length is given by 
where 
To keep the wait in line reasonable, it is required that the average line length should not exceed 5 customers. Determine the range of rates at which customers can arrive before a second attendant is needed. Express your answer in interval form.
A. [0, 19) B. [0, 17] C. [0, 16] D. [0, 18]