9514 1404 393
Answer:
3 6/7
Explanation:
The nearest perfect squares are ...
3² = 9
4² = 16
Then an approximation of the root can be arrived at by linear interpolation.
√15 ≈ 3 +(15 -9)/(16 -9) = 3 6/7 . . . . . where 16 and 9 are the nearest squares