1. The tide depth in a Pacific harbour from noon on March 1, 2012 to noon the next day can be modelled by the cubic function f(t) = 0.001+ - 0.061+ 0.870t +0.315 where fis the tide depth in metres and t is the number of hours after noon. Determine the tide depth at 10:00 on the second day.

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.