What is the maximum value of the function f(x) = 2x^2 - 5x + 3 over the interval [-1, 3]?
+
Find the integral of 2x^3 + 5x^2 - 4x + 3 with respect to x.
+
If there are 50 students in a class and the average weight of the boys is 75 kg while the average weight of the girls is 60 kg, what is the total weight of the class?