10. How can you tell if a number is divisible by 4? A. The last digit is even.
B. The last two digits of the number are divisible by 4.
C. The first digit ist.
D. The sum of the digits is divisible by 4.

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.