ANSWER:
[tex]\begin{gathered} (0,0) \\ (2,5) \\ (6,15) \end{gathered}[/tex]
STEP-BY-STEP EXPLANATION:
In this case, the first thing is to calculate the function that describes the situation that would be the following
[tex]\begin{gathered} y=2.5x \\ \text{where y is the amount of sand and x is the elapsed time} \end{gathered}[/tex]
Now, we replace the inputs (that is, values of x, therefore it would be 0, 2 and 6 seconds
[tex]\begin{gathered} y=2.5\cdot0=0\rightarrow(0,0) \\ y=2.5\cdot2=5\rightarrow(2,5) \\ y=2.5\cdot6=15\rightarrow(6,15) \end{gathered}[/tex]
We graph it as follows:
