Which of the following values can you find by calculating the slope of a graph of velocity versus time position . displacement . acceleration . velocity

The correct answer is: acceleration.

In fact, the slope of the graph of velocity versus time corresponds to the ratio between the variation of v and the variation of t:

But this is exactly the definition of acceleration: , so acceleration is the correct answer.

Independent variable is something that is changed in a experiment. 

The purpose of a lab is to do your "expirements" the importance of the topic is so you can now what the story is about and the last one is because no one is me with my question ( what is 3 over 4 x - 9 = 27 maybe you can )