Well, looking at the graph, notice, its vertex is at 0,9, and it passes through the points -3,0 and 3,0, so hmm let's use 3,0, to get the equation of f(x)
the height of the rectangular box is 4 times its width, and its length is 2 in more than its width. the volume of the box is 60i
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The answer is square root of 31. Attached is a picture with step by step explanation
