Please help me this is a bit confusing (none of my calculators will do this)

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6