9. For any function &, the integral Soj( x)dx represents (a) positive real number () area under f from x=a to x=b none 10. Average value of the function f (x)-ex on interval [,2] a ) e e 2 - 11. Soxy - zydx = 2 - 2 - 4 e none 12, integral (x x can be evaluated by (a) integration by parts U - Sub (@) both 13. Let f(x) = 2x+3 on the [a, b]. Then ( a) fave = atb+ 3 10 ) fave = at6- 3 @none K. Easiest way to evaluate the integral Standx a ) V = COSX V = sin x () u = tank