Use the substitution method to solve the system of equations: y - 5x = 7; y = 3x - 9

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

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

Name the quadrilaterals that have four equal sides.