exam Maths Puzzle Numerical Ability

Jon has a 26-ft ladder leaning against his house.If the bottom of the ladder is 10 ft. from the base of the house, how high does the ladder reach.

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exam Other Question

x^3-18x^2+81 /could you please explain the steps to simplify expressions. We have not received our books, yet.
equation:
(m + 11) + 19

Thank you, very much.