MATHEMATICS · Subjective · AP · Calculus AB · Limits and Continuity · Limits and Continuity
Problem
In a fish tank, the dissolved oxygen concentration D(t) (in mg/L) is a continuous function of time t (in hours). If D(4)=9 and D(15)=5, determine whether there exists a time t with 4<t<15 such that D(t)=7. Justify your conclusion.