Can some show the steps and the answer please I really need help tell me how you get it and the answer

Ashopper bought a watermelon a pack of napkins and some paper plates in his state there was no tax on food the tax rate on non-food items is 5% the total for the three items he bought was 825 before tags and he paid $0.19 in taxes how much did the watermelon cost

At which value in the domain does f(x) =0?

Solve the system of equations y= 3/2 - 1, -x+ y =-3