A jar contains 2 blue cubes, 5 blue spheres, 2 green cubes, and 5 green spheres. If you select an object at random, what is the probability that the object is green or a cube?

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.