To find the number of days, divide the total swam by the average:
Days = 48 / 3.2 = 15
They swam for 15 days.
your answer is 15.8 (im pretty sure)
Keep the bases of 6 and add exponents: 
Keep the bases of 11 and add exponents: 
So its C.
hope that helps :)
Answer:
-3 is the answer.
Step-by-step explanation:
