The arithmetic growth rate is mathematically expressed as:

• A

  dN/dt= rN

• B

  ${\mathrm{L}}_{\mathrm{t}} = {\mathrm{L}}_0 + \mathrm{rt}$

• C

  ${\mathrm{W}}_1 = {\mathrm{W}}_0 {\mathrm{e}}^{\mathrm{rt}}$

• D

  dN/dt= rN(K-N/K)