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kodGreya [7K]
3 years ago
12

Need help bad! Number 21 to be exact.

Mathematics
2 answers:
alisha [4.7K]3 years ago
8 0
#21)
<span>Using Pythagorean Theorem a^2 + b^2 = c^2
so
</span>a^2 = c^2 - b^2


x^2 = 42^2 - 38^2
x^2 = 1764 - 1444
x^2 = 320
 x =√320
 x = √(64 * 5)
 x = 8√5
katen-ka-za [31]3 years ago
6 0
  A^2+B^2=C^2
A^2+38^2=42^2
A^2+1444=1764
       -1444=-1444
          A^2=320
A=the square root of 320
A=the square root of 16*20
A=4 the square root of 20

Hope this helps!!
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Carmen simplifies the expression and gets the coefficient of y is 10. Thus, the correct option is C.

<h3>What is simplification?</h3>

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