Please answer question number 13

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

To decrease an amount by 16% what single multiplier would you use

Subtract and simplify. (-y^2 – 4y - 8) – (-4y^2 – 6y + 3) show how you got the answer if your answer is right i will mark you