A model for the specific gravity of water S is given, where T is the water temperature in degrees Celsius. (a) Use the second derivative to determine the concavity of S. (b) Use a computer algebra system to find the coordinates of the maximum value of the function. (c) Use a graphing utility to graph the function over the specified domain. (Use a setting in which 0.996 ≤ S ≤ 1.001.) (d) Estimate the specific gravity of water when T = 20°
