How do i solve this equation? 6 - 0.25f = f - 3

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

50 will mark show all use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2x+9y= -26 -3x-7y=13