What is the principal square root of 64?
A. -8
B. 8
C. 4
D. -4

B. 8

Step-by-step explanation:

The principal square root is another word for the positive square root. The square root of a number is the number that equals a given number when multiplied by itself.

In this case, 8*8 = 64. -8*-8 also equals 64, but we are looking for the principal square root here, so the only answer is 8.

Hope this helps!

so, converting firstly the mixed fractions to improper fractions and then "adding".