D. 6 1/2
Just divide 13 by 2 and you will get 6.5 or 6 1/2
Step-by-step explanation:
I'm sorry if my terminology isn't correct because I've learnt it slightly differently, but what I'm assuming is this:
For A, you can rewrite the integers as 28-15+22 as a + and a - next to each other result in a subtraction.
For B, you simply do 15+22 is 37 and 28-37 is -9 due to BIDMAS (or PEDMAS if you're American).
Answer:
8
Step-by-step explanation:
PEDMAS