26. Describe the concavity of the curve described by 2x2 - y* =y-c+ 1 at the point (3, 4). O the function is not differentiable at (3, 4) O concavity cannot be determined O concave up O concave down O point of inflection 27 -2 0 2 5 7 2 1 5 3 1 The table above shows values of f / for selected values of . Given that f (x) is continuous, which of the following statements must be true of f ? O f is concave up. O f has at least 2 points of inflection. O f is increasing. O f has no critical points. O f has at least 2 relative extrema.17. The base of a solid is the region in the first quadrant bounded by y = a and y = x2 - 6. If the cross-sections perpendicular to the y - aris are squares, what is the volume of the solid? O 7.402 3.768 6.069 O 7.114 9.003 18. The base of a solid is the region bounded by y = In(I) y = 0 and x = 4. Each cross-section perpendicular to the x-axis is a rectangle with a height of h = 3 . What is the volume of the solid? 9.455 5.021 O 4.292 11.434 7.887 19. The base of a solid is the region in the first quadrant bounded by r = 2 and the function f (x) = 2 2. If the cross-sections perpendicular to the x-axis are semicircles, what is the volume of the solid? 1.082 0.531 6.799 0.266 2.125 20. If an object's velocity may be measured by the equation v(t) = vt + 1 for 2