exam Maths Puzzle Numerical Ability

Please I need help with this radical equation:

The Square root of 7s - 20 = 6

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exam Other Question

18 / 2(3) + 4(5) / -22 + 12 I hope this is posted in the correct place. I need some help I do not understand how to do this. Thanks for any help you can give.
solve by elimination process and type an ordered pair.
4x - 9y = 14.5
7y - 2x = -8.5