1. The problem is to solve the expression or equation involving the variables 2), D, and t. 2. Since the problem is unclear and incomplete, we need to clarify or assume what is asked. Assuming you want to solve for D in terms of t or vice versa, or evaluate an expression. 3. If the problem is to solve for D given an equation like 2)D = t, it might be a typo or incomplete. 4. Please provide a complete equation or expression to solve. Since the input is incomplete, no further steps can be taken.