Answer:
(f+g)(x)=2x+1+5 - x
(f+g)(x)=x + 6
(f - g)(x)= 2x + 1 - (5- x )
(f - g)(x)= 3x - 4
1h = 8.5 x2 = 17
1 1/2h = 8.5 x3 = 25.5
2h = 8.5 x4 = 34
2 1/2h = 8.5 x5 = 42.5