book Maths Puzzle Numerical Ability

CD rollover. Ronnie invested P dollars in a 2-year CD with an annual rate of return of r. After the CD rolled over three times, its value was P((1 + r y^2)^3. Which law of exponents can be used to simplify the expression? Simplify it.

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book Other Question

I'm not understanding the elimination technique that my teacher is explaining. My problem is:
3x+3y-2z=-32
x-3y+z=11
-x-3y+3z=23

I don't understand how to substitute after
Find two consecutive positive integers such that the sum of their squares is 85.