book Maths Puzzle Numerical Ability

what is the square root of 400 and 900

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book Other Question

Find the slope of a line perpendicular to the line y=-3 and passing through (3,4) express your answer in slope intercept form.

Thanks Caroline if 35% of a school was 8th graders and there are 252 8th graders, what is the total school population?

thanks for the help