A Ferris wheel has a radius of 30 m, makes a full rotation in 3 minutes, and the axle stands 35 m above the ground. when will it first reach the maximum height, if t=0 occurs when the rider is at the bottom of the ride?

a)135sec

b)180sec

c)90sec

d)45sec

A culture of bacteria triples every 12 minutes. How long it would take for the original amount to double? Round your answer to the nearest minute.

a)7

b)6

c)9

d)8