Asurveyor standing 67 meters from the base of the building measures the angle to the top of the building and finds it to be 36 degrees. the surveyor then measures the angle to the top of the radio tower on the building and finds it is 46 degrees. how tall is the radio tower?
my choices are: a. 11.81m , b. 20.7 m, c. 7.66 m, d. 8.81 m
any advice or assistance is appreciated.

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.