Which of the following is closest 27.8×9.6

Match the equivalent expressions. x - 3y + 12 12 - 3y - 2x + x + 2x 3x + 2y - 2x + y + 12 3y + 12 3x + y - 12 4y + 3y + 3x - 6y - 10 - 2 x + 3y + 2x - 3x + 7 + 5 x + 3y + 12 5 + 2y + 7x - 4x + 3y - 17

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Find the solution of this system of equation -7x+y=-20 9x-3y=36