AP Calculus AB problem

4. The rate at which water is sprayed on a field of vegetables is given by R(t) = 2 v t + 5t , where t is in minutes and R(t) is in gallons per minute. (a) Write a function W (t) that can be used to determine the amount of water sprayed on the field at any time, t. (b) How much water has been sprayed on the field during the first 10 minutes