Pls help What is the domain of the function represented by this graph?

a. all real numbers.

b. x > 4

c. x < 0

d. -2 < x < 2

An object is accelerating at a constant rate. its velocity in feet per second as a function of time in seconds can be modeled by the linear function v(t) = 2.5t. what does the dependent variable represent for this function? a) acceleration b) distance c) slope d) velocity