Can someone please help me with questions 18 and 19 please. Will give brainilist to best answer.

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

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