Book Maths Puzzle Co-ordinate geometry

If a circle has an area of 144(pie) what is it's circumference?

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I am a father who has not used algebra since 1972!! My daughter ia having an issue with, How to solve an equation using fractions. ie: "1/3x+2=6" I am stumped. can you break it down for us.

Thanx.

Glenn Thanks - I can't figure out this problem and it is due tomorrow!

y=4X^2 - X + 6

We are suppose to sketch a graph of t he equation.