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Step-by-step explanation:

Graph shows the distance traveled by a biker as a function of time.

Velocity of the biker changes in the different intervals.

1). In the interval 0 < t < 2, biker is moving with a constant velocity.

   Velocity =

             =

             = 2 km per hour

2). In the interval 2 < t < 5,

   Velocity =

                  = 0

   Therefore, biker stopped between 2 to 5 hours.

3). In the interval 5 < t < 6,

   Velocity =

                  =

                  = 1 km per hour

4). In the interval 6 < t < 7,

   Velocity =

                 = 3 km per hour

the answer is (-4,-4)

hope this ! : d