I don't think its possible to do this... you have to have 2 equations
The initial value of the graph is where
. Thus, in this case, the initial value is 12.
The rate of change of the graph is essentially the slope of the graph. In this case, we can use the slope formula:

and
are points on the graph
Let's use two points from the chart to find the slope:

In this case, the rate of change of the graph is 9.
Deceleration is always the opposite of Acceleration so is negative. So deceleration =-2.2m/s^2
Answer:
its C i believe i put it in a calculator and it gave me that answer