sorry it's sideways please help me out

The position of a particle moving on a horizontal line (where a is in feet to the right of a faed reference point and I is in seconds after the suit of the observation) is [) =r'- 8 +15, 120. (A) Find the velocity, in feet per second, at time t off) -] (B) Find the velocity (in net) of the particio at time r = 3. (C) Find all values of f for which the particie is at fest. (if there are no such values, erfor more . If there are more than one value, list mem separated by commas ) (D) Use interval notation to indicate when the particle is moving in the positive direction. (If needed, enter in) for co. If the particle is never moving in the positive drection, enter none ) (E) Find the total distance (in feel) traveled during the first 8 seconds Note: You can earn partal cread on this problem Preview My Answers Sutiri Answers You have apempted this problem O times You have unlimited attempts remaining Email Instructor