exam Maths Puzzle Numerical Ability

Factor completely:
2x3 - 26x2 + 80x

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exam Other Question

Graph f(x)=-x-2

I am not sure how to come to the solution in order to graph it. I would like some assistance with this problem please.

A metal stays solid at Fahrenheit tempretures below 1817.2 degrees. Determine (in terms of inequality) those Celsius tempretures for which the metal stays solid. Use the formula
F=9/5 C+32.