Answer:
5 family members went swimming with the dolphins.
Explanation:
From the information given, you can say that the total cost for the family to swim with dolphins is equal to the flat fee for the family to rent wet suits plus the extra cost per person for the number of family members:
1024.99=75+189.99x, where x is the number of family members
Now, you can solve for x:
1024.99-75=189.99x
949.99=189.99x
x=949.99/189.99
x=5
According to this, the answer is that 5 family members went swimming with the dolphins.