% Speedometer readings for a motorcycle at 12-second intervals are given in the table. mnnaaaam mmaamaaa ..(a)..Esti.ma.te._the distance traveled by the motorcycle during this time period using the velocities at the beginning of the time intervals. ' Enter an exact number. (b) Give another estimate using the velocities at the end of the time periods. :1 ft (c) Are your estimates in parts (a) and (b) upper and lower estimates? Explain. O (b) is a lower estimate and (a) is an upper estimate since v is a decreasing function oft. O (a) and (b) are neither lower nor upper estimates since v is neither an increasing nor decreasing function of t. O (a) is a lower estimate and (b) is an upper estimate since v is an increasing function of t