book Maths Puzzle Numerical Ability

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.

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book Other Question

HOW DO YOU SOLVE THE FOLLOWING PROBLEM?

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


(1) 2x+y=5