17 feet
Step-by-step explanation:
15^2 + 8^2 = c^2
15^2 + 8^2 = 289
square root of 289 is 17
17 doesn’t belong. It’s a prime number and the only number with an odd digit in the tenths place. Let me know if this helps please!
If you need the whole problem 11 x 11 = 121
Here you go hopes this helps