Why is it necessary for you to set a degree 2 polynomial equation equal to zero in order to solve? Name the property.

maybe - definition of supplementary angles. im not sure. sorry

step-by-step explanation:

$450 i think. hope this ☺

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yx = 36

step-by-step explanation:

cos f = opposite side/ hypotenuse

cos f = yw / yx

we know cos f = 4/9 and yw =16

4/9 = 16/yx

multiply each side by yx

4/9 yx = 16/ yx * yx

4/9 yx = 16

multiply each side by 9/4

9/4 * 4/9 yx = 16 *9/4

yx = 36