Anna found the difference between thirteen and the product of four and a number. Which expression represents this phrase, and what is its value if n = 3? StartFraction n Over 4 EndFraction minus 13; when n = 3 the value is Negative 12 and one-fourth 13 minus 4 n; when n = 3 the value is 1 4 n minus 13; when n = 3 the value is –1 13 minus StartFraction n Over 4 EndFraction; when n = 3 the value is 12 and one-fourth

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

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.