A particle moves along a straight line with velocity v(t)=t+2 meters/second. Assume that the time t is measured in seconds. Suppose that t[0] .. t[3] divide the interval [2,8] into 3 equal intervals. Use these subintervals and the right endpoints as sample points to compute a Riemann sum which approximates the distance travelled by the particle for the interval of time [2,8].

How do I do this? Everytime I do it I get 98 as an answer