Question 3,4 and 5 please

4. On what intervals is the function 2x3 - yzInx increasing or decreasing? 5. The initial size of a bacteria culture is 1 200. After 6 h, there are 8400 bacteria. a. Find the number of bacteria after t hours. b. Find the number of bacteria after 10 h. C. Find the rate of growth after 6 h. d. When will the bacteria population reach 20 000? 6. Discuss the curve y = In(9 - x2) under the following headings. a. Domain. b. Intercepts. C. Symmetry. d. Asymptotes e. Intervals of increase or decrease f. Maximum or minimum values g. Concavity h. Sketch of the curve