exam Maths Puzzle Numerical Ability

Solve, and express you answer in exact form: log(x) + ln(x) = 1

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exam Other Question

A triangle plot of land has sides of lengths 130ft, 110ft, and 100ft. Approximate the smallest angle between the sides. Use elementary row operations to write the matrix in echelon form:
[2 4 2 6]
-2 1 3 4
3 2 1 5

please someone help me figure this out and if anyone could tell me how to writ