Help me with answers b and d (WILL GIVE BRAINLY)

Answer:
Step-by-step explanation:
For a, (6 times 2)
For b, (40-15)
For c, (15 divided by 5)
For d, I am not sure
I think there might be a mistake if I am right
If I am right it is (15 divided by 5 plus 3) for d