Let's solve for the other leg length
a^2 + 21^2 = 42^2
a^2 + 441 = 1764
subtract 441 from both sides
a^2 = 1323
take the square root of both sides
a = sqrt.(1323)
a = 21 sqrt.(3)
The correct answer is C.) The length of the remaining leg is 21 sqrt.(3).
Hope this helps
Answer:
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Step-by-step explanation:

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Answer:
Hiya There!!!
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Isolate the variable by dividing each side by factors that don't contain the variable.
x
= 1
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