Jack is 2 times as old as Lacy. 5 years ago the sum of their ages was 20. How old are they now?
1 answer:
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Answer:
1/2 rational exponent represents a square root.
Therefore, option A is correct.
Step-by-step explanation:
As we know that raising to the one-half power i.e. is the same
as taking the square root.
- so
is the same as the square root of
.
For example, taking the square root of 4 will determine:
so the expression becomes
∵
so, 1/2 rational exponent represents a square root.
Therefore, option A is correct.