## KJ4UTS one year ago Use the table below, which gives the cost (C) of n bags of fertilizer, to decide which of the following statements are true.

1. KJ4UTS

2. KJ4UTS

It looks like A. the n-values are evenly spaced. B. looks like there is a constant difference Im not exactly sure about C. and D. here.

3. zepdrix

Constant means unchanging. From $$\large\rm 18.75$$ to $$\large\rm 25$$ we saw a change of $$\large\rm 6.25$$ but from $$\large\rm 25$$ to $$\large\rm 29.50$$ we saw a change of $$\large\rm 4.50$$. Uh oh, the space between the C(n)'s isn't staying constant, right?

4. KJ4UTS

yeah not constant

5. zepdrix

So that makes B not true. Which automatically makes C not true because it's talking about a specific constant value.

6. zepdrix

For the function to be linear, C(n) needs to have constant differences. So what can you say about D?

7. KJ4UTS

So if there not staying constant then its not true?

8. zepdrix

Correct :) So D must be not true as well.

9. KJ4UTS

@zepdrix A. looks like it true?

10. zepdrix

Only A? Yah good job!

11. KJ4UTS

@zepdrix Yeah only A., now for something to be linear it has to be constant? In order to be a straight line. For this problem I think it would be C. because the average rates of change are not constant?

12. KJ4UTS

@zepdrix