To determine the total cost of the order, you need to set the expression equal to the total amount. If you already have expressions for the cost of cashews and peanuts, you can express the total cost like this:
\[ 3c + 2.5p = T \]
Where:
- \(3c\) is the cost of cashews (with \(c\) representing the quantity of cashews and \(3\) being the cost per unit),
- \(2.5p\) is the cost of peanuts (with \(p\) representing the quantity of peanuts and \(2.5\) being the cost per unit),
- \(T\) is the total cost of the order.
You can substitute \(T\) with the actual total cost once you know that amount. If the problem provided a specific total, you would insert that value for \(T\). Otherwise, \(T\) remains as the variable representing the total cost.