8
9
10
Or 11???how can I do this

your answer is A - 9

Step-by-step explanation:

This is your answer, let me explain why

If he borrowed 105 and he is paying back 12 per week, then to figure out how many weeks he will need to give 12 dollars until he has paid his brother back the 105 he borrowed from him, so we will first have to divide 105 by 12,

105 ÷ 12 = 8.75

but when this is done you will get 8.75, which is not an option below so we have to round to the nearest hundred, thus giving us the answer, 9.

Hope this Helped!

because they could drop even lower..