need help please

3. (8 pts) Find the average value of g(t) = 213 + 2t over [-1, 3]. 4. (10 pts) Students' exam scores were found to approximately follow a Normal distribution with a mean of 70 and a variance of 100. Using the provided table of Normal Probabilities, find the probability a student's score is: (a) (5 pts) Between 65 and 80 (inclusive) ? (b) (5 pts) 87.5 or above ? 5. (14 pts) Let f(x) = x In(x2). (a) (8 pts) Find the locations x of all critical values of f (x). (b) (6 pts) Use the second derivative test to classify each critical value as a location of a relative maximum, relative minimum, or neither.\f