## anonymous one year ago Help in Algebra 1 question Screenshot below!

1. anonymous

:))) Part B and C are my struggles

2. anonymous

Does that have an affect on the overall answer for part A because I figured that I just didn't find it relevant to state.

3. anonymous

@inowalst plz help!

4. anonymous

ok, it looks like your answer for A is mostly correct. Your domain for this function would be [0, 6] because those are the relevant x values. It looks like you used y-values for each part. The function is increasing on (0, 3) and decreasing on (3,6).

5. anonymous

Omg thank you soo much :D

6. anonymous

C would be which tho cuz its rate of change isn't that time and speed or something?

7. anonymous

^^That was a correction for A. For b, it's asking for the domain (x-values) if the minimum of the function was \$60. You want to look find the two points on the graph where y = 60, and use them to be the domain for B.

8. anonymous

would it be then (60,1) AND (60,5) ?

9. anonymous

x comes first, so (1, 60) and (5, 60). Which means the domain would be [1, 5]

10. anonymous

For C, any function can have a rate of change. It just has different meanings for different applications. For this function rate of change is amount of profit gained or lost for each increases in price

11. anonymous

Ok and also another question regarding A you wrote (0, 3) wouldn't that be (0,30) because the 3 isn't shown?

12. anonymous

It's kind of hard to keep track of when you're starting out. Domains/ranges are represented by intervals, which uses the same notation as points. (0, 3) in part A is an interval, meaning the function is increasing from x = 0 to x = 3. It's not the point (0, 3).

13. anonymous

does that make sense?

14. anonymous

ohhh :D

15. anonymous

yes it does make sense when its not meaning a point :P

16. anonymous

ok. for part C do you need help finding the rate of change?

17. anonymous

Yes i do cuz honestly I dont understand rate of change what so ever i figured its just the number but its a lot more confusing than it seems for me lol if that makes sense

18. anonymous

let me ask you this, do you know how to find the slope given 2 points?

19. anonymous

$m=\frac{ y_2-y_1 }{ x_2-x_1 }$ look familiar?

20. anonymous

isn't the slope y=mx+b

21. anonymous

10-5 m= _____ 5/3 6-3

22. anonymous

y=mx+b y= 5/3+b

23. anonymous

right?

24. anonymous

y= mx+b is the equation of a line. The slope is just m. Your problem has a parabola. But you can use the same formula to find rate of change. They want rate of change from 3 to 5. When x = 3, y = 120 When x = 5, y = 60 $m=\frac{ 60-120 }{ 5-3 }=\frac{ -60 }{ 2 }=-30$

25. anonymous

so the rate of change is -30

26. anonymous

ahhhhhh :D :D :D :D Ok That makes a lot more sense thank you so so so much for all your help and I will give u medals so check ur notifications thanks so much :D

27. anonymous

you're welcome :)