To add fractions with different denominators you must convert the denominators into the lowest common factor. Aka the multiple they all go into. You then times the numerator by what you timsed the denominator by to make sure they both have the same denominator. Example:
Answer:Sphere A has a diameter of 12 and is dialated by a scale factor of 1/2 to create sphere B. What is the ratio of the volume of sphere A to sphere B? oh ok i know what is it A the second one is B