Answer:
Joe is correct
Step-by-step explanation:
Given equation:

The exponent outside the bracket is a question mark and the students are trying to determine the value of the question mark.
For ease of answering, let y be the unknown number (question mark):

First, simplify the equation by applying exponent rules to either side of the equation:







Now, apply the exponent rule:

Therefore,

Finally, solve for y:



Therefore, <u>Joe is correct</u> as the unknown number is 6.
<u>Answer-</u>

<u>Solution-</u>
We know that arc length is the product of radius and central angle in radian.
i.e 
Here,

So,




√49z²
= √(7z)². [ here, Square cancles sq. root]
= 7z
May be Helpful.
Thank you!