Write (y-8)(y-8) and solve from there.
Since the question doesn't state whether he wants his students to make the figure larger or smaller we can just find both.
Multiply by 3 to make the sides larger.
2 * 3 = 6 inches
3.1 * 3 = 9.3 inches
4.5 * 3 = 13.5 inches
3.9 * 3 = 11.7 inches
Divide by 3 to make the sides smaller.
2 / 3 = 0.66... inches
3.1 / 3 = 1.033... inches
4.5 / 3 = 1.5 inches
3.9 / 3 = 1.3 inches
Mark said 5 inches, so, he is incorrect.
Samantha said 6 inches, so, she is correct.
Divia said 1.3 inches, so, she is correct.
Cheng said 0.9 inches, so, he/she is incorrect.
Candice said 11.7 inches, so, she is correct.
Best of Luck!
The power rule is basicaly just multiply the number by itself for how ever man powers there are, so if it was
![5^{8}](https://tex.z-dn.net/?f=%205%5E%7B8%7D%20)
, you would multiply 5*5*5*5*5*5*5*5 and then get your product, and it is just inverted for a quotient, hope this helps