First estimate the answer. Then add or subtract to find the exact answer. Write answer as a mixed number.
A. Estimate: 8; Exact: 
B. Estimate: 7; Exact: 
C. Estimate: 7; Exact: 
D. Estimate: 8; Exact: 
Answer: D
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Solve.Important news is said to diffuse through an adult population of fixed size L at a time rate proportional to the number of people who have not heard the news. Four days after a scandal in the mayor's office was reported, a poll showed that half of the people had heard about it. How long will it take for 99% of the people to hear about it?
A. 29 days B. 28 days C. 27 days D. 30 days
Simplify the expression.3y(xy + y) - 9y 2(x - 2 + 5y) + 2(y 3 + y 2)
A. - 6xy 2 + 21y 2 + 20y 3 B. - 6xy 2 + 23y 2 - 43y 3 C. 12xy 2 + 21y 2 - 43y 3 D. 6xy 2 + 21y 2 - 20y 3 E. none of these
Provide an appropriate response.Divide 5 days by 4.
A. 1 day 6 h B. 1 day 2 h C. 1 day 4 h D. 1 day E. none of the above
Find the expected value.A car agency has found daily demand to be as shown in the table.
Find the expected number of customers.
A. 9 B. 12 C. 10 D. 2