https://pt.khanacademy.org/math/algebra-home/alg-exp-and-log/alg-solving-exponential-models/e/exponential-models-word-problems?modal=1
Clique na hiperligação https://pt.khanacademy.org/math/algebra-home/alg-exp-and-log/alg-solving-exponential-models/e/exponential-models-word-problems?modal=1 para abrir o URL.