Let R be the region in the first quadrant bounded by the graph of y = -x- + 1 and the x-axis. R is the base of a solid whose cross sections perpendicular to the x-axis are semicircles. What is the volume of the solid? O 120 15 O O 3For time t 2 0, the velocity of a particle moving along the x-axis is given by v(t) = sin(e0.31). The initial position of the particle at time t = 0 is x = 1.25. What is the displacement of the particle from time t = 0 to time t = 10? O 2.020 O 3.270 6.903 O 8.153