Proably about 500 milleleters
Answer:

The inverse function is to calculate the number of rides; given the amount paid
Step-by-step explanation:
Given

per ride
Required
Explain the inverse function
First, we calculate the function
Let x represents the number of rides
So:



For the inverse function, we have:

Swap x and y

Make 3y the subject

Make y the subject

Replace y with the inverse function

The above is to calculate the number of rides; given the amount paid
Answer:
+7
Step-by-step explanation:
if you go from 28 to 21 you see there is a difference of 7 and sense the number is a smaller number now we know the dolphin went up more towards the surface there for there is a change of positive 7
28-21=7