book Maths Puzzle Numerical Ability

HOW DO YOU SOLVE THE FOLLOWING PROBLEM?

1. IF RADIUS OF A CIRCLE IS 8.6CM WHAT IS THE AREA AND CIRCUMFRANCE?

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book Other Question

3[2+v]-4v=v+16 Hi I need a little help with this problem. The directions are to find the LCD and do not combine fractions.
13/x^2-16, 7/x-4
If you could show how you did the problem it would be a big help.. Thank you.