If I have 25 dollars and want to buy something for 14 dollars and 99 cents how much money will I have left

Can someone me do math because i am having a breakdown rn because i don’t get it

If f(x) = 3x2 - 2x+4 and g(x) = 5x + 6x - 8, find (f-g)(x).

Franklin is purchasing a home for $82,107 and is financing 80% of it. the documentary stamp tax on the deed in his state is $0.70 per $100 or portion thereof. how much will he pay for the documentary stamp tax?