exam Maths Puzzle Numerical Ability

How do I find the length x in the triangle with sides of 10, 8, x? I am supposed to express my answer in simplified radical form. How do I do this? Please help, Thanks

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exam Other Question

$10,000 in two mutual funds, one rose 6% in one year and one rose 9% in one year. It rose a total of $684 in one year. How much was invested in each mutual fund? y=x-5

is this function increasing, decreasing, or constant