Book Maths Puzzle Number Series

Find the geometric mean of the two numbers 5 and 15. Leave answer in simplest radical form.

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Book Other Question

To reach a damsell in distress, a knight places a 13-foot ladder against the castle wall. The base of the ladder is 7 feet less than the distance from the top of the ladder to the ground. How high on the castle will the ladder reach? how do you convert y=-1/2x+5 to standard form?