Find the numerical value of the expression for the given value.
, x = -9
A. Undefined
B. 
C. 0
D. - 
Answer: A
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Answer the question.Suppose that a test for a disease correctly gives positive results for 95% of those having the disease and correctly gives negative results for 90% of those who don't have the disease. Suppose also that the incidence of the disease is 1%. If a person tests positive for the disease, what is the chance that they have the disease? Find the exact percentage.
A. 8.8% B. 13.4% C. 95% D. 10%
Solve the problem.Find the amount of money in an account after 5 years if $2800 is deposited at 7% annual interest compounded monthly.
A. $3949.68 B. $3961.38 C. $3969.35 D. $3927.14
Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where c is the cost in dollars, and x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 39 watches B. 61 watches C. 40 watches D. 30 watches
Solve.Ben lost $319 on each of 5 consecutive days in the stock market. If he had $16,217 before his loss, how much does he have after his loss?
A. $1595 B. $17,812 C. $14,622 D. $15,898