Find the Lowest Common Multiple (LCM) of 21, 63 and 105. A 15

B 63

C 105

D 315​

A ) 15 I think because it the lowest number!

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.