Write the DE for a stated rate of change

1. A.
   $\dfrac{dr}{dt} + k = 0$
2. B.
   $\dfrac{dr}{dt} - k = 0$
3. C.
   $\dfrac{dr}{dt} + kr = 0$
4. D.
   $\dfrac{dr}{dt} - kr = 0$

Tap an option to check your answer.

1. A.
   $\dfrac{dP}{dT} = \dfrac{kP}{T^2}$
2. B.
   $\dfrac{dP}{dT} = \dfrac{P}{T^2}$
3. C.
   $\dfrac{dP}{dT} = \dfrac{kT}{P^2}$
4. D.
   $\dfrac{dP}{dT} = \dfrac{T^2}{P}$

Tap an option to check your answer.