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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exam Other Question

How would you slove:

square root of 3y-2 = 3 - square root of 3y+1

I know you would multiply both sides to the second power, getting only 3y-2 on one side but the other side
Write the equation of the line passing through the given point with the indicated slope. Give your results in slope-intercept form, where possible.

(0, 5), m = - 3/5 (3 over 5 in fraction form)

Thank you.