Integrate both sides to get.....
dp/dt =-30(t^-4)
Integrating both sides
p= (-30t^-3)/-3 + c
p=10t^-3 + c
subs in t=2, p=5.25
therefore c=4
Just subs in t=5 for five days
Look at the 10t^-3 for the last part
Just wondering what textbook is this from?
