exam Maths Puzzle Numerical Ability

A wire of length x is bent into the shape of a circle. Express the circumference C of the circle as a function of x.

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exam Other Question

Please help me solve this problem.

5x^2-19x-10

(i am not sure how to sqaure something on the computer so i made ^2=raised to the 2nd power) I am really stuck on this math homework problem i got the rest but not this one. How do you graph this equation by using the slope and a point on the line. this is the question y-2=3(x-5)