exam Maths Puzzle Numerical Ability

The bottom of a 13-foot long ladder is placed 5 feet away from a wall so that the ladder rests against the top. Assuming the wall is perpendicular to the ground, what is the height of the wall?

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exam Other Question

Write the equation of the line passing through each of the pairs of points. Write your result in slope-intercept form, where ever possible.
(2,-3) and (2,4)

Mcgraw Hill 6th edition, chapter 7.3, problem #24. Thanks so much for your help!!! Thank you in advance for help with this equation. x^4-8x^2+11=0