book Maths Puzzle Numerical Ability

3(1.3^x)=X^2-2

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book Other Question

The width of a rectangular window is 10 feet less than twice its length. If the perimeter is 28 feet, find the dimensions of the window. be sure to show all of the following.
a) l this is a practice problem for a placement test for college. I have the answer but I dont understand how they got it. Help Please! 7x-8(y-x)+3y= 5(3x-y)