book Maths Puzzle Numerical Ability

solve the quadratic equation (x-3)squared=36 by the square root method.

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book Other Question

One sum is invested at 5% and three times as much at 8%. The total annual interest is $580. How large is each sum?
(this is not from a text) I have a problem with both answers.
Please help, Thank You. find the x-intercept and y-intercept of the line -x+7y=21