Question

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Answer 1

x = 15.58845727

Explanation:

use the pythagorean theorem.
`a^(2) + b^(2) = c^(2)`

fill in the 2 digits you know.
`9^(2) + x^(2) = 18^(2)`

then simplify.
`x^(2) = 18^(2) - 9^(2)` which is
`x^(2) = 243`

and you get
`\sqrt{x^(2) } = √(243)`

you can simplify
`x = 15.58845727`

Answer 2

Answer: 15.6

Step-by-step explanation:

Equation: A^2+B^2=C^2

Step one: 9^2=81

Step two: 18^2=324

Step Three: 324-81=243

Step four: square root the 243 which gives you the answer.