exam Maths Puzzle Numerical Ability

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!

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exam Other Question

I need help on how to use geometric formulas. I am working on this problem:
Perimeter of a square
P = 4s;s Celia bought 12 apples. She ate two of them. She sold the remaining apples for 20 cents more than she bought each of them. She profited $1.00. How much did she sell the apples for?