exam Maths Puzzle Numerical Ability

Ladder Height.
A 10-m ladder is leaning against a building. The bottom of the ladder is 5m from the builder. How high is the top of the ladder?

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exam Other Question
Preform the indicated operations and simplify:

(v-5/v-7)-(v+1/v+7)+(v-35/v^2-49)

Thank you I really need help with this!!! 7/2x+1/2x=3x+3/2+5/2x