I will give a brainliest and 20pts to the person that can use the Pythagorean theorem to solve for x. Please help. I went over i
t several times and the answer I got doesn't match up with what the box says 
1 answer:
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Answer:
A
Step-by-step explanation:
Since the triangle is right use Pythagoras' identity to find EF
The square on the hypotenuse is equal to the sum of the squares on the other two sides, that is
EF² + DF² = DE² ← substitute values
EF² + 12² = 18², that is
EF² + 144 = 324 ( subtract 144 from both sides )
EF² = 180 ( take the square root of both sides )
EF = → A