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Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick