The following figure has the graph $y=d(t)$, which models a particle’s distance from the starting line in feet, where $t$ stands for time in seconds since timing started. If you would like to enlarge the graph or make numbers and letters easier to read, you may click on it to open it in a new window. You may then enlarge that window with your mouse. To further enlarge the image, use your browser’s zoom capabilities. On a PC this is usually ctrl shift + (and zooming out is ctrl -). On an Apple computer this is usually apple shift + (and zooming out is apple -).

1. $d(6)=$
2. Interpret the meaning of $d(6)$:
   A. The particle was $6$ feet away from the starting line $3$ seconds since timing started.
   B. In the first $6$ seconds, the particle moved a total of $3$ feet.
   C. In the first $3$ seconds, the particle moved a total of $6$ feet.
   D. The particle was $3$ feet away from the starting line $6$ seconds since timing started.
3. Solve $d(t)={1}$ for $t$. Use commas to separate your answers if there are more than one solution. $t=$
4. Interpret the meaning of part c’s solution(s):
   A. The article was $1$ feet from the starting line $9$ seconds since timing started.
   B. The article was $1$ feet from the starting line $1$ seconds since timing started, or $9$ seconds since timing started.
   C. The article was $1$ feet from the starting line $1$ seconds since timing started.
   D. The article was $1$ feet from the starting line $1$ seconds since timing started, and again $9$ seconds since timing started.