Answer:
54 dollars, my baby brother completed this math for you
Explanation:
Let x be the rental fee for the kayak for 3 days.
Then, we can write:
x + 16 = 70
This equation represents the total amount Ronald paid, which includes the rental fee for the kayak and the cost of the guided waterfall tour.
To solve for x, we can subtract 16 from both sides of the equation:
x = 70 - 16
x = 54
Therefore, Ronald paid $54 for the rental fee to use the kayak for 3 days.