You can factor 12 from both terms to get

Answer:
B
Step-by-step explanation:
If the diameter of sphere B is 42, that means the radius is half, so it is 21.
The question is asking what multiplied by 24 is 21, or 21 divided by 24. 21/24 can be simplified to 7/8.

solve for "a", to see what Africa's population will then be
I’m pretty sure the answer is (2,1)