Select the pair of equations whose graphs are perpendicular.

A.) 5x - 8y = 9

12x - 5y = 7

B.) 3x + 6y = 8

y = 3x - 8

C.) y = 2x - 7

x + 3y = 3

D.) 2y = - 3x + 5

2x - 3y = 4

Sketch a horizontal cross section

If you can only use 3 of these numbers once to find a sum of 30 without subtracting or adding additional numbers, what three numbers would you use out of 1, 3, 5, 7, 9, 11, 13, and 15? () + () + () = 30

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80,+84, + 82, + 79, + 72, + 97, + 89, + 97, + 88, + 79, + 86, + 90, + 87 =

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