360 is the answer because 90 times 4 is equal to 360
If you're simplifying the equation your answer is going to become -d^3 +3d^2 +23d -30
Use A: to find the value of x. In order to find that you would have to match one part of the proportion. x should be the numerator over 15 and 12 should be over 20 (The total length of that side of the triangle). Good luck. : )
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