I currently doing maths level 3 a home and struggling a bit with integration...

...any help would be very welcomed.? I `m alight once i get started it just getting there i can work them out when in integral sign is present but struggling to work out this question

The depth of fluid , H cm , in a vessel at time t minutes is given by

H = 16 + 4t + 2t^2 - t^3/16

determine the rate at which the depth is changing after 4 mins

If the cross - section of the vessel is circular of diameter 2m , determine the rate of filling , in m3 min^-1 , at this time
 
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