Laurent invested some money in a bank account.
The relationship between the elapsed time, ttt, in decades, since Laurent invested the money, and the total amount of money in the account, M_{\text{decade}}(t)M
decade

(t)M, start subscript, start text, d, e, c, a, d, e, end text, end subscript, left parenthesis, t, right parenthesis, in dollars, is modeled by the following function:
Mdecade(t)=4900⋅(1.5)t