If the diameter of a circle is 24, what is the circumference? Round to the nearest thousandth. a
75.398
b
3.820
c
150.796
d
7.639

The answer is A.
c=2 x pi x r

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.