What is the value of x in the triangle ?

The geometric mean has to multiply to 100. There’s a 4. To get to 100, you need a 25. AB+DB should equal 100. So x would have to equal 21. To prove this, 25 x 4 = 100. The square root of 100 is 10 which proves the answer for x is 21. I hope this helps!

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Short 7

Why?

We can put this problem into an equation. Since it's a multiplication problem, we divide the known numbers. (It can either be 9 * x = 63, or 63 / 9) Divide. (63 / 9 ==> 7) The answer is 7.

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