19. Use the Fundamental Theorem of Calculus to evaluate: 12/2x (x + 8)dx 20. An object has a constant acceleration of 72 feet per second squared, an initial velocity of 17 feet per second, and an initial position of 10 feet. Find the position function describing the motion of this object. 21. Write the definite integral that represents the area of the region formed by y = x + 2x+1 and y=2x+5. Do not evaluate! 22. Sketch the region bounded by f(x) = x-1 and g(x)=x-1 AND find the area. 23. Sketch the region bounded by y = x +3x+1 and y=-x+1 AND find the area.