Help with both answers thanks.
And no links pls

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)