find the length of a rectangular prism having a volume of 2,830.5 cubic meters,width of 18.5 meters, and hieght of 9 meters
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Let y = f(x). By the fundamental theorem of calculus, differentiating f(x) twice yields
y is concave upward wherever f''(x) > 0. The denominator is positive for all real x, so the numerator determines the sign of f''(x). We have 6x + 1 = 0 when x = -1/6, and
• for x ∈ (-∞, -1/6), we have e.g. with x = -1, 6x + 1 = -5 < 0
• for x ∈ (-1/6, ∞), we have e.g. with x = 0, 6x + 1 = 1 > 0
Then y is concave upward on the interval (-1/6, ∞).