exam Maths Puzzle Numerical Ability

Find the length x in the triangle. Express your answer in simplified radical form. Side 1=10. Side 2=8. Side 3=x

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exam Other Question

Solve for x: 3^x+2 plus 3^x = 270
Please use steps
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How to answer this quesiton with logs appearing in at least one of the steps?

Thanks:) Solve by the substitution method.

4x+7y = 34

-3x+y = 12

Can someone please HELP me with this problem. I do not understand it at all!!