book Maths Puzzle Numerical Ability

Hello,I am a junior in Honors Pre-Calculus and I am not sure how to do these problems:

1) Suppose you have 102m of fencing to make two side-by-side rectangluar enclosures, as sh

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book Other Question
How do I simplify the following, assuming X, and Y are not zero?

-x^2y
(-x^2)^2y^2 how do you solve equations that have different logs: log5(x-4) = log7x, solve for x
The 5 and the 7 are little