(Geometry) PLZ HELP ASAP

Nnnnneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

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)

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?