Question

Help?? Will give medal, fan, and write testimony.

Answer 1

Answer what you can, please show your work.

Answer 2

@ganeshie8

Answer 3

@satellite73

Answer 4

@amistre64

Answer 5

@jim_thompson5910

Answer 6

@nincompoop

Answer 7

@iambatman

Answer 8

@myininaya

Answer 9

@aum

Answer 10

thats quite a lot, can you narrow it down to any one in particular?

Answer 11

I don't need you to answer all of them, but really just answer any that catch your eye, or that you can do.

Answer 12

i can do all of them, but me giving you an answer is not going to help you much in my opinion. they even have a small review before a set of questions.

if i dont know what you need help sorting out, then i dont know what a good tutoring path to take.

Answer 13

Okay, basically, I need numbers 3-55 all odd. I have been sick, and have a horrible teacher, and my book isn't working. So I really have no other options than this and it is making me go crazy.

Answer 14

Why don't we start with 3 and 5. I don't know how to do that.

Answer 15

tell me your thought on #3

Answer 16

its just an application of the example that they did for you after all

Answer 17

Yes it is a function.

Answer 18

can you tell me why thats your choice?

Answer 19

Because none of them share the same x coordinate?

Answer 20

well, thats a good observation, but not quite accurate. if a point was doubled then we would have a smae x coord, but also a same y coord with it becuase its the same point.

if 2 different points have the same x part, then its not a function

Answer 21

Oh

Answer 22

#5 has to have an assumption, we have to assume that any 2 or more points that are above/below one another share the same x value, but differ in ys

Answer 23

are there any points that we can assume are above/below another?

Answer 24

wait so on #3 why is it a function?

Answer 25

#3 is a function since for any given x value, there is only 1 y value to associate with it

Answer 26

since all the x parts are difference values to start with then its safe to say that no x value has more than 1 y value associated with it

Answer 27

*are different values ....

Answer 28

Oh I see now.

Answer 29

how about #5?

Answer 30

On #5 we could assume that there are points beneath the bottom points on the graph shown?

Answer 31

of all the points we see, we need to assume that if one point is above another, that they share a common x value. otherwise the question has no single correct solution.

Answer 32

can you visually tell the difference between x=.000001 and x = .000002 ??

Answer 33

So it is not a function?

Answer 34

why can we assume its not a function?

Answer 35

I don't think so

Answer 36

Because the points share the same x

Answer 37

which points? how would you define them as best you can?

Answer 38

errr..

Answer 39

I honestly, don't know.

Answer 40

well, either some points look like they fit on a vertical line, or they dont

Answer 41

Some of them do look like they fit on a line.

Answer 42

assume we are able to draw a perfectly vertical line up and down thru any x value, are there any points that look like they would get hit by this line?

Answer 43

1.5 and -3.5

Answer 44

right?

Answer 45

at x about -1.5 i see 2 points that seem to be in a line top to bottom

Answer 46

Yeah

Answer 47

then if we ask what is the value of y at x = -1.5 .... we get 2 different answers. so its not a function

Answer 48

what are you thoughts about #7?

Answer 49

still working on that

Answer 50

so far I have this f(-2) = -x +4
f(-2) = 2 + 4

@amistre64

Answer 51

whoops

Answer 52

f(-2) = -x +4
f(-2) = 2 + 4
f(-2) = 6

f(-0.5) = -x + 4
f(-0.5) = 0.5 + 4
f(-0.5) = 4.5

Answer 53

i would have prefered -(-2), then simplify to 2 but thats fine

Answer 54

if you can mentally work the double negative, more power to you ... but it can sometimes come back to bite you

Answer 55

How so?

Answer 56

f(3) = -x + 4
f(3) = -3 +4
f(3) = 1

Answer 57

is all of that right?

Answer 58

thats all fine

Answer 59

I don't know how to do #9

Answer 60

what is a direct variation?

Answer 61

when two quantities increase and decrease at the same rate

Answer 62

good, so if we have the setup

y = kx, then when y gets big, x gets big and k stays the same

Answer 63

11 does use direct variation but I don't think 9 does

Answer 64

all we need is 2 points of reference to determine k

Answer 65

I don't know much about it. So....

Answer 66

yeah, 2/3 is not equal to 1/4 so its not a direct constant variation

Answer 67

1/1 = 2/2 = 5/5 gives us a direct variation, can you think of a y=kx that fits it?

Answer 68

No...

Answer 69

How would I find one that does?

Answer 70

oh is the y=kx the rule?

Answer 71

if the ratio, the fraction, of x/y is the same for all point x,y then we have a direct variation

ideally tho thats backwards but works anyways. the equation you want to determine is some y = kx for a constant value of k: hence k = y/x for any point x,y

Answer 72

is it the rule?

Answer 73

if you want to call it a rule, sure

Answer 74

Okay, is is y=x?

Answer 75

yep

Answer 76

thats for #11 right?

Answer 77

yeah

Answer 78

#9 has no equality to determine so its just not workable by the instructions

Answer 79

so the answer is literally no

Answer 80

correct

Answer 81

now #13 and #15 are the last ones for me

Answer 82

tell me what you think its asking for

Answer 83

Alright, and thank you so much for your help. I really do appreciate it.

Answer 84

yw

Answer 85

uh are they asking for the k in y=kx?

Answer 86

yep, so define k = y/x for the given y and x, then determine the new y when x=-.3

Answer 87

so k= -0.5/2?

Answer 88

another way to see it is:
\[k=\frac{y_1}{x_1}=\frac{y_2}{-.3}\]
\[y_2=\frac{-.3~y_1}{x_1}\]

Answer 89

y2 = -.3(2/3)
-------
.2


y2 = -3/2 (2/3) = -1

Answer 90

whoops I accidentally was doing 12.

Answer 91

lol, 12 is fine for practice as well

Answer 92

So the COV is -1?

Answer 93

no, COV is y1/x1 = (2/3)/.2 = 20/6 = 10/3

Answer 94

the value of y2 is -1

Answer 95

-1/-.3 = 10/3

Answer 96

Ohh.