The diameter of one circle is represented by 12x. the diameter of another circle is represented by 6x^2y. what is the ratio of the radii of the two circles?

D/2=r


so we don't even need to convert
12x:6x²y
divide both sides by 6x
2:xy
the ratio is 2:xy

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.