Heather dropped a water balloon over the side of a building from a height of 80 feet. The approximate height of the balloon at any point during its fall can be represented by the following quadratic equation. h= -16squared plus 80. About how long did it take for the balloon to hit the ground?

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.

The value of cos 30° is the same as which of the following?

Ofin . (2,4) (2,1) a. y= 2 b. x= 2 c. x= -2 d. y= 2x