Can someone please explain it to me ASAP?!!! This is velocity and net changes. I need help for part b. It says what is the breathing rate in breaths/minutes? I first I said 12 didn't work then I said 25 it did not work. What is the correct answer for this question?!!!

A simple model for the flow of air in and out of the lungs of a certain mammal is given by the following equation, where V(t) (measured in liters) is the volume of air in the lungs at time ( 2: 0, t is measured in se Complete parts a through c below. and t= 0 corresponds to a time at which the lungs are full and exhalation begins. Only a fraction of the air in the lungs is exchanged with each breath. The amount that is exchanged is called the tidal volume V' (t ) = - 6 sin . . . . . * A. V(t) = V(0 ) + V' (x) dx. O B. V(0) = V(t ) + V' ( x ) dx. 0 b b O C. V(t) = V(0 ) + V' (t) at . O D. V(0) = V(1) + V'(1) at. a a Find the volume function V, assuming that V(0) = 14 L. V(t) = cos "t |+ 13 (Type an exact answer.) b. What is the breathing rate in breaths/minute? The breathing rate is 25 breaths/minute. (Type an integer or a simplified fraction.)