## anonymous one year ago help please Instructions Part 1 You will need to measure five different people. Record your measurements on a piece of paper. Using a tape measure or ruler, measure the length (in inches) of a person’s left foot and then measure the length (in inches) of that same person’s forearm (between their wrist and elbow). Refer to the diagrams below. You will have two measurements for each person. (An easy way to measure the length of a foot is to have your subject stand on a piece of paper. Then, trace their foot and measure the outline once they move off the paper.)

1. anonymous

To measure the forearm, measure inside the arm, between the wrist and the elbow. Part 2 Organize your data and find the rate of change. A.Create a table of the measurements for your data. Label the forearm measurements as your input and the foot measurements as your output. B.Select two sets of points and find the rate of change for your data. C.Describe your results. If you had to express this relation as a verbal statement, how would you describe it? Part 3 Compare rates of change. A.The equation below can be used to find the length of a foot or forearm when you know one or the other. (length of the foot) = 0.860 • (length of the forearm) + 3.302 If you let y = length of the foot and x = length of the forearm, this equation can be simplified to y = 0.860x + 3.302. Using this equation, how long would the foot of a person be if his forearm was 17 inches long? B.What is the rate of change of the equation from Part A? Compare the equation from Part A to your data. Are they the same? Which has a greater rate of change? Why do you think the values are different? C.Is the relation in your data a function? Why or why not? Could the equation in Part A represent a function? Why or why not? Explain your answer.

2. jim_thompson5910

post what you have so far

3. anonymous

ok here my measurements I just asked random people outside lol [img]/drawings/8c4728ebf86186b4cc1bea96def9a8d7.png[/img]

4. jim_thompson5910

you'll have to attach the drawing

5. anonymous

|dw:1437708012599:dw|

6. jim_thompson5910

So E is 7 inches for the left arm? and E is 8 1/2 inches for the right arm?

7. anonymous

its left arm and left foot for all of ( A--->E)

8. jim_thompson5910

oh nvm

9. jim_thompson5910

E is 7 inches for the left arm? E is 8 1/2 inches for the left foot?

10. anonymous

yes

11. jim_thompson5910

so they want you to make x = length of left arm and y = length of left foot?

12. anonymous

yes I think that's what its asking but what im stuck on is how do I put my measurements in to an input and output chart? is there a rule I have to follow? and how do I find my rate of change?

13. jim_thompson5910

the inputs look like the length of the arm (ie x) the outputs are the length of the foot (ie y)

14. jim_thompson5910

$\Large \text{rate of change} = \frac{\text{change in y}}{\text{change in x}}$

15. jim_thompson5910

|dw:1437708710614:dw|

16. anonymous

so like slope? what would my input/output chart look like?

17. jim_thompson5910

|dw:1437708739677:dw|

18. jim_thompson5910

yeah rate of change = slope

19. jim_thompson5910

you either use the data you gathered or this equation they give you (length of the foot) = 0.860 • (length of the forearm) + 3.302

20. anonymous

ok so let me see if I got the gist of it my entire input and output chart is above and to find the rate of change I plug both the input and ouput into the equation you gave? to get the final result ( part 3) of my question? o.o

21. jim_thompson5910

it says B.Select two sets of points and find the rate of change for your data.  so you can select say these two points |dw:1437708968206:dw| find the difference in y, then the difference in x, then divide (y over x) to get the slope

22. anonymous

so this--> 8-7/7 1/2-6 1/2 = 1/1 =1 as my slope?

23. jim_thompson5910

correct

24. anonymous

now that I got the slope what do I do with it?

25. jim_thompson5910

well that's all they want for part B

26. jim_thompson5910

C.Describe your results. If you had to express this relation as a verbal statement, how would you describe it?  hint: y = mx+b m = slope b = y intercept

27. anonymous

y=1x+b how do I choose/find my b intercept?

28. jim_thompson5910

you plug in any (x,y) point you used to find the slope

29. jim_thompson5910

|dw:1437709744884:dw|