Question 7 1pts The rule of the derivative of a function f is given. Find the location of all local extrema. f'lX) = (x2 - 1)(X + 3} 0 Local maxima at -3 and 1; local minimum at -1 0 Local maximum at -3 + ~Jg local minimum at -3 - ~J 0 Local maximum at 1; local minima at 3 and 1 0 Local maximum at 3 5; local minimum at -3 + lg Question 8 1 pts Solve the problem. 1 64 A truck burns fuel at the rate (gallons per hr) of G(x)=g[? i] while traveling at x mph. If fuel costs $127 per gallon, nd the speed that minimizes total cost for a ZED-mile trip. Round to the nearest tenth. O 56.0mph O 62.2 mph 0 56.5 mph 0 49.5 mph