exam Maths Puzzle Numerical Ability

If the radius of a circle is 8 in. then what is the circumference?

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exam Other Question

Graph the functions: f(x) = -2x - 5. I am not doing to well with these fuctions, so any help with trying to graph one is greatly appreceated. Thanks what set of numbers do:

pi
0
-35
-31.8

belong to a piece?