Answer:
C and D
Step-by-step explanation:
The given information permits us to calculate the circumference (C) of the wheel as follows

Then (as you said correctly!) the same wheel will move

after 16 rolls.
Answer:
3 1/4 gallons or 3.25 gallons
Step-by-step explanation:
777 divided by 21 = 34 with a remainder of 3