3.4 Exercise 114

The function $A \left(d\right)$ gives the pain level on a scale of 0 to 10 experienced by a patient with $d$ milligrams of a pain-reducing drug in her system. The milligrams of the drug in the patient’s system after $t$ minutes is modeled by $m \left(t\right) .$ Which of the following would you do in order to determine when the patient will be at a pain level of 4?

1. ⓐEvaluate $A \left(m \left(4\right)\right) .$
2. ⓑEvaluate $m \left(A \left(4\right)\right) .$
3. ⓒSolve $A \left(m \left(t\right)\right) = 4.$
4. ⓓSolve $m \left(A \left(d\right)\right) = 4.$