This is hard in mathematical language, but there is only this way to present it. Let us denote by A the consentration of the substance and by A' its rate. We have that b/A= t+c where c is a constant. Hence A=b/(c+t) By differentiating, we get that A'=-b/(C+t)^2 Then, we have that -(A)^2=A'/b Hence at any point, we have that if we make the concentration 17 times, we have that there is a 17 times bigger , the rate will become bigger by 17*17, hence 289 times faster.
