exam Maths Puzzle Numerical Ability

I need help on how to use geometric formulas. I am working on this problem:
Perimeter of a square
P = 4s;s

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exam Other Question

how do i graph the line x-y=1 on a graph? Expand and simplify: ln(xe)
Thats the problem that has been driving me crazy. I dont uderstand how logarithms work so any help with this is very much appreciated. Thanks so much!