The circumference of C is 72cm. What is the length of AB (the minor arc) A. 45cm
B. 10cm
C.9cm
D. 8cm
E. 90cm
F 7.2cm

No i refuse to tell you the answer but the estimate is 10

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.