1. The production cost for f x biscuits by a food corporation is calcuated by f(x) = 65 x + 500 (in Php). How much will the cost of:
a. 10 biscuits be?
b. 15 biscuits?
c. 20 biscuits?

2. Altheo has about P575 excess from his budget for groceries. He is saving up for a new gadget for his online class. He saves P25 from allowance per week for this gadget. How much will he be able to save in 3 weeks using the function notation f(x) = 25x + 575?
a. For 3 weeks?
b. For 10 weeks?
c. Twenty-five weeks?

Use polya's method in solving. With explanation please​