Abbie collects 5p coins. on tuesday she adds 7 more coins to her collection. how much money did abbie add on tuesday?

Is the product of seventeen negative numbers, positive or negative ?

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.

How does reflecting or rotating a figure change the interior angles of the figure?