Final answer:
The cost for fishing for 3 1/2 hours is $141.47.
Step-by-step explanation:
The cost for fishing for 3 1/2 hours can be found by multiplying the hourly rate of $15.99 by the number of hours, which is 3.5. Then, add the boat rental fee of $85.50 to the product of these two numbers.
Step 1: Calculate the product of the hourly rate and the number of hours: $15.99 x 3.5 = $55.97.
Step 2: Add the boat rental fee to the product: $55.97 + $85.50 = $141.47.
The cost for fishing for 3 1/2 hours is $141.47.