Use integrals and the graphs of flat) = 1 + x and glx) = 3 x to determine the area between the graphs of f and g for 0 s x s 3. . A robot has been programmed so that when it starts to move, its velocity after t seconds will be 3t2 feetjsecond. 4- ....u n .. I n . .. a. . . I 4- .n