Somo people say that the ideal recipe for sand sculptures contains 88.9% sand. which team recipe is closest to the ideal recipe

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.

What line represents the relationship between r and s

In the next 10 month,colin wants to save $900 for his vacation.he plans to save $75 each of the first 8 months. how much must he save each of the last 2 months in order to meet his goal if he saves the same amount each month ?