## anonymous one year ago A food packet is dropped from a helicopter and is modeled by the function f(x) = −12x2 + 19200. The graph below shows the height f(x), in feet, of the food packet at different times x, in seconds: Use the graph to determine the reasonable domain of f(x) based on the context. All real numbers x ≤ 19200 −40 ≤ x ≤ 40 0 ≤ x ≤ 40

1. anonymous

2. anonymous

@Loser66

3. anonymous

Hey can you help me out?

4. Loser66

What do you think?

5. anonymous

im not sure, i was thinking maybe A, but im bad at math

6. Loser66

|dw:1437400145854:dw|

7. Loser66

when something falls, does it stop at the ground or go under the ground?

8. anonymous

It stops at the ground

9. Loser66

Yes, so, although the graph passes the x axis, in fact, when it hits the ground, the function stop working, right?

10. anonymous

right

11. Loser66

hence, from the right, it stops here. |dw:1437400344228:dw|

12. Loser66

From the left, when does it start?

13. anonymous

Idk i cant really see the graph

14. anonymous

0?

15. Loser66

|dw:1437400421399:dw|

16. anonymous

-40

17. Loser66

nope, the graph starts at -40, but the food package start falling at 0

18. anonymous

Ohh okay

19. Loser66

|dw:1437400509562:dw|

20. Loser66

Hence from the left it is $$0\leq x$$

21. anonymous

D?

22. Loser66

Combine, what do you get?

23. Loser66

YEEEEEEEEEEEES

24. anonymous

YYAAAY

25. anonymous

thankyou so much, that one was really hard