Question

What number is to be subtracted from 0.006898 to make it a perfect square? a 0.000008 b 0.000007 c 0.000009 d 0.000006?

Answer 1

the answer is (c).

you can try every answer choice here.

for me, i did 0.006896 - answer choice a, or 0.000008, and got the square root of the difference, which did not work, so (a) is wrong.

i did the same for each choice, and it worked for c, as 0.006896 subtracted by 0.000009 is 0.006889, and the square root of 0.006889 is 0.083.