The value of a laptoptyears after it is purchased is given by the decreasing functionV, whereV(t) is measured in dollars. The rate of change of the laptop's value in dollars per year is proportional to the laptop's value. Which of the following differential equations, with the correct description of constantk, could be used to model the value of the laptop?

The value of a laptop t years after it is purchased is given by the decreasing function V, where V(t) is measured in dollars. The rate of change of the laptop's value in dollars per year is proportional to the laptop's value. Which of the following differential equations, with the correct description of constant k, could be used to model the value of the laptop? Odv v "k' where k is positive. dt O dv dt V' K where k is negative. Odv -= kv, where k is negative. dt O dV = kt, where k is positive. dt