Find the two square roots of each number

Ok, so the first step is to know how to  find the square root of a number. The square root of 25 is 5, The square root of 1 is 1. The square root of 25/4 is 2.5, the square root of 121/49 should be 3 1/7

10feet apart then both

Iam guessing c. or d.