Mark and Billy find a set of power tools with a price tag of D dollars. They also find a pair of water skis at the cost of D plus $15 and also some jewelry with the cost of D -5 dollars each product has a discount the power tools are 15% off the water skis are 25% off and the jewelry is 10% off. The two expressions in terms of D to show how much Mark and Billy would pay if they buy a set of power tools
The price of the power tools before the discount is 15% off, so the discount amount is 15/100 * D = 0.15D.
Therefore, Mark and Billy would pay D - 0.15D = 0.85D dollars for the power tools.
However, to answer your question, it seems that you are looking for two expressions in terms of D to show how much Mark and Billy would pay if they buy a set of power tools. Since Mark and Billy are purchasing the same set of power tools, they would pay the same amount. Thus, the expression in terms of D to show how much Mark and Billy would pay for the power tools is 0.85D dollars each.