exam Maths Puzzle Numerical Ability

The diagonal measure of a rectangular computer monitor screen is 53 cm. If the screen is 45 cm wide, then how tall is it?

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I cant find a good example of how to graph a porabola in x-itercept and y-intercept form. Can you explain these to things better to me in note form pleas. It would really help me out in my math class. Thank you. Exercies in radicals. The problem asks for the fifth root of 147. How do we simplify or solve this expression? Thanks so much