After a special medicine is introduced into a petri dish containing a bacterial culture, the number of bacteria remaining in the dish decreases rapidly. The relationship between the elapsed time ttt, in seconds, and the number of bacteria, N(t)N(t)N, left parenthesis, t, right parenthesis, in the petri dish is modeled by the following function: N(t)=4900⋅(38)t7 Complete the following sentence about the rate of change in the number of bacteria. The bacterial culture loses \dfrac{5}{8} 8 5 ​ start fraction, 5, divided by, 8, end fraction of its size every seconds.