please help me with question 2,3,4

1. Consider the function: J(z) - -20 + 82 - 10r + 4 (a) Find the y-intercept of J. (b) Determine the interval(s) where f(2) is increasing or decreasing. (c) Find all local maxima/minima for f(2) (if any). (d) Find interval(s) on which f is concave upward or concave downward. (e) Find all inflection points. (f) Sketch the graph of f (2). Be sure your sketch incorporates the informa- tion from the previous part 2. Consider the function: (a) Find z-intercepts and y-intercept of g. (b) Determine the interval(s) where g(r) is increasing or decreasing. (e) Find all local maxima/ minima for g(r) (if any). (d) Find interval(s) on which gi ich q is concave upward or concave downward. (e) Find all inflection points. (f) Sketch the graph of g(r). Be sure your sketch incorporates the informa tion from the previous parts 3. Find the absolute maximum and the absolute minimum of the following func- tion on [-1, 3]: 4. The number of salmon swimming upstream to spawn is approximated by: S(T) - -T* + 372 + 3607 + 5000. 6 = T : 20 where T represents the temperature of the water in degrees celsius. Find the water temprature that produces the maximum number of salmon swimming upstream