To find the common denominator, self-add the denominators until they reach a common number. I will self-add 6 and 8 for 5 times each until we reach a common number. 6: 6, 12, 18, 24, 30. 8: 8, 16, 24, 32, 40. They have a common number, 24. Your least common denominator is 24. I hope this helps!
The correct answer is choice D. 48, because the denominators of the two fractions going into 48 evenly, but they don't go evenly with any of the other options.
The volume of a sphere is (4/3)(pi)(r^3). To find the radius, divide the diameter of 2.8 to get 1.4. Then plug it in to get 11.49. 11.49 rounded to the nearest tenth is 11.5 cm^3.
