Final answer:
The total cost for renting a kayak for k hours and a paddleboard for p hours is represented by the additive expression k + p, which corresponds to option A.
Step-by-step explanation:
The question involves determining the expression that represents the total cost for Mister Thompson to rent a kayak for k hours and a paddleboard for p hours. In real life, cost calculations are typically additive when you are combining two separate charges, so each item rented will have a cost associated with the number of hours it is rented for. Therefore, if we assume the cost to rent a kayak is a certain amount per hour and likewise for the paddleboard, the total cost would be the sum of the cost of renting the kayak for k hours and the paddleboard for p hours. This sum is represented as the sum of two terms, suggesting an additive operation.
If we were to write an expression without knowing the specific hourly rates, we would represent the total cost as the cost per hour for the kayak times the number of hours k, plus, the cost per hour for the paddleboard times the number of hours p. Mathematically, this would be some constant (c1) times k, plus some other constant (c2) times p: c1*k + c2*p. However, without those constants in the provided options, we assume them to be 1 for simplicity. As a result, the expression that aligns with this scenario is simply k + p, which matches option A.
It is important to note that the original information about pKw and its values is irrelevant to the question being asked and appears to be part of a different discussion related to chemistry and not to the cost calculation for kayak and paddleboard rentals. Therefore, it does not factor into the solution for this problem.
The final answer is option A.