Mathematics, 25.08.2021 03:30 shayshayyy41
A cell phone company bills on a monthly basis each bill includes a $45 service fee plus $3.20 in taxes and zero dollars for $.10 for each minute over the given 500 minutes per month
Write an expression to describe the cost of the cell phone service per month where X represents a number of minutes over 500
If a company raises the service fee how will expression change?
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Answers: 2
Mathematics, 21.06.2019 20:50
An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.
Answers: 3
Mathematics, 21.06.2019 21:30
In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.
Answers: 2
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