Question

this is my last day to do my work if i don't then i will fail math can some one please help me ?

Answer 1

I hate to be Mr. obvious, but this is the wrong day to start.

Answer 2

^^

Answer 3

so, betty lee, please post the question you want help with, right off. Next time, don't spill the beans about having waited until the last minute; then we can't tease you.

Answer 4

Thanks for your wisdom, Mr. Obvious.

Answer 5

okay @mathmale thank you so much im not trying to do a sob story but ive really being crying i need to pass math but i dont get anything.

Answer 6

The table shows the number of miles driven over time. Express the relationship between distance and time in simplified form as a unit rate: ___________ mph. Write a statement that interprets the relationship: _________________________________________________.
Time (hours)
3
5
7
9
Distance (miles)
171
285
399
513

Answer 7

?

Answer 8

Mathmale I'm stepping out, less confusion 1 on 1. betty, he will steer you straight.

Answer 9

OK, Betty Lee. I won't rub it in. Next time you have a test coming up, get onto OpenStudy one full week in advance.

Now, Betty, I'm going to Bet that this is a linear relationship (such as y=mx+b).

Answer 10

After 3 hours the distance is 171.
After 5 hours the distance is 285.
What was the change in time?
What was the change in distance?

Answer 11

well i have been on open study for the pass two weeks no one has helped me and i don't understand and i have an f if i don't pass then i don't know what to do!

Answer 12

@ehuman : All the best to you. A worthy fellow you are. I'm assuming you're a fellow, of course.

Answer 13

i dont know anythign @mathmale

Answer 14

Please stop saying that. Think, "with time on task and proper guidance, I can learn just about anything my teachers throw at me."

Answer 15

lol yes, my avatar is a pic of me and my youngest son when he was just born.

Answer 16

How much does t change? Simply subtract 3 from 5, and you end up with 2 (hours).
How much does the distance change? Simply subtract 171 from 285.

Answer 17

well everyone is different this is my 3rd time failing math so yeah!!!!!!

Answer 18

Please, betty lee, stop the negativism; it simply hurts you.

Answer 19

Please answer my question.

Answer 20

114?

Answer 21

Yes. Great. that's in miles.
If you divide 114 miles by 2 hours, what do you get? Be certain to include the units of measurement (miles, hours).

Answer 22

57 miles right

Answer 23

Yes, that's fine. Very nice. Now go back to the first question I asked you: What's the change from 171 miles to 285 miles? (subtract 171 from 285).

Answer 24

sorry @mathmale my computer went dead

Answer 25

So did mine. So I went to take a nap!
What's the change, from 171 to 285 miles?

Answer 26

okay so the first question I don't understand

Answer 27

You've already answered one of my questions properly. You divided 114 by 2 and got 57. If you were to do the same type of calculation with 285-171 you'd get 114 again. You divide that by 2 (hours) and you end up with 57 miles per hour, or 57 mi/hr..

Answer 28

so you have essentially solved this first problem.

Answer 29

okay so the answer was 57mils which I had already put down as my answer

Answer 30

Go back and look at the problem that you posted. It asks you to produce the unit rate: 57 miles per hour. You already have that! Here's what it means in words: Each hour, the driver covers 57 miles. So the rate of change of distance with time is 57 miles per hour."
then you're done.

Answer 31

that's it. Post the next question, please.

Answer 32

Find the slope of the line. M= __________

Answer 33

What is the slope of the line? M= _____________

Answer 34

This focuses on the same principle: rate of change. Earlier, you subtrancted mileage and subtracted time; you ended up finding the rate of change, or slope, which was 57 miles/hr.

This graph gives you data in a different manner: it's graphical data.

Look at those arrowheads. One of them is at (4,7) and the other at (-4,-5).
You need to calculate how much y changes as you travel left to right from -5 to +5.

Do it, please. You could count the number of squares between -5 and +7, or you could subtract (-5) from (+7).

Answer 35

-2 ? that's what im subtracting right

Answer 36

Just do this: 7-(-5)= ???? and we'll answer your verbal question later.

In the third problem, y does not change. In other words, your slope is zero. Simple as that.

Answer 37

what is (-)(-) ?

Answer 38

12

Answer 39

Important: the slope formula is m=rise/run.
\[slope=m=\frac{ rise }{ run }\]

Answer 40

This is what you're calculating right now for the 2nd problem.

Note that this formula seems to be mentioned in both Problem 2 and Problem 3. You'll need to find some way to learn and memorize this formula.

Answer 41

Yes, thank you. 7-(-5)=12. You're doing fine.
Now find 5-(-5).

Answer 42

okay so was that answer correct >

Answer 43

Yes, it was correct. The "rise" (meaning the change in y) was 12.

Answer 44

10

Answer 45

Now you're calculating the "run," the change in x. Yes, it's 10.

Now divide 12 by 10. that's rise/run. Simplify. What do you get?

Answer 46

I got 1.2

Answer 47

\[\frac{ rise }{ run}=\frac{ 12 }{ 10 }=what.fraction?\]

Answer 48

Cool. That's the answer. In #2, the slope is 12/10, or 1.2. See? You're doing fine.

Now in the third problem, y does not change. Thus, the rise is zero, but the run is not.
What is the slope? rise/run = ???

Answer 49

is it 1 over 1 ?

Answer 50

Please go back and re-read what I typed. The rise is ... ?
Then the slope is rise/run = ( ??? )/run = ???

Answer 51

I just did I don't understand how you got the number

Answer 52

is it 1/2

Answer 53

rise = "new" y - "old" y.
Here, y starts at -2 and ends at -2 (no change). What is -2-(-2)? rise = ????

Answer 54

Please calculate the rise, as defined above.

Answer 55

0

Answer 56

That's right. supposing that "run" is not zero, what would slope=rise/run be equal to?

Answer 57

2/2 or 2.0

Answer 58

or 1

Answer 59

Don't see how you got that . We want the ratio rise/run. If rise is 0 and run is not 0, what is their quotient?

Answer 60

honestly I don't know if its 0 then 0 right ???????

Answer 61

Yes. Why? 0/(5)=0, right? Doesn't matter what the denominator is, so long as it's not zero. 0 div by a non-zero number is 0. So, your slope is zero (0). You should be able to recognize that instantly , visually, from the graph: that horiz. line has a slope of zero.

Answer 62

oh ojay that was my first answer but I didn't think it could only be 0

Answer 63

It's extremely important that when you see a horiz. line, you think immediately": the slope is zero.

Also, you should know that 0 divided by any nonzero quantity is 0.

I ahve time for one more question. Have you more qeustions?

Answer 64

What is the slope of a line passing through the pair of points (2, 10) and (8, 3) that's the next question

Answer 65

You'll need to find the slope of that line connecting the two given points. You do exactly the same thing as before: you calculate m = rise / run. This problem will be a little harder because in this case the slope is negative; that means that if x increases, y decreases. Pls review what we did earlier and see if you can find rise/run. (there's more than one way to do it!!)

Answer 66

8/-5

Answer 67

?

Answer 68

@nikato can you help

Answer 69

No, that's not correct. Try using the slope formula

Answer 70

http://www.purplemath.com/modules/slope.htm

Answer 71

So if u substitute in ur points to find the slope, u'll get

10-3
------=
2-8

Can u simplify this?

Answer 72

Betty: as I suggested before, the result of these calculations will be negative; you have a negative slope, a negative "rise" with a positive "run" Memorize that slope formula.

Answer 73

nikato's suggested web resource is a good one.
http://www.purplemath.com/modules/slope.htm

Answer 74

@mathmale im lost

Answer 75

dam. still helping? respect to mathmale

Answer 76

Sorry, but I was out to dinner with friends.

The latest slope is (10-3) / (2-8), or 7/(-6). This slope could also be written -7/6. That's it.

Answer 77

If you have more questions to discuss on Sunday, please post them.

Answer 78

@mathmale im hereeeee

Answer 79

i have 10 more questions to go if you can pleaseeee help me with those i'll pass!!!!

Answer 80

Mathmale, that is an awesome example of help! Many thanks.

Answer 81

Betty: Can't promise I'll have time to help you with all 10 questions, but I'll help with some. Please look for those 10 questions and pick the ones that appear hardest to you. Choose one of the hardest and post it. Also please respond to that question in some way: by asking questions, by showing preliminary work, or whatever. I want to see what you've done, because that shows me what you know and what you don't know.

Answer 82

@mathmale im heree i have done some problems but dont know if there right

Answer 83

Just post it. I can try checking them

Answer 84

i only did two problems so il'l try posting them

Answer 85

Ok

Answer 86

What is the slope of a line passing through the pair of points (-3/2-5) and (-2 11/2)

Answer 87

i got 6/-11

Answer 88

Can u rewrite th points? Remember to put commas between the points. And what did u get as ur answers?

Answer 89

(-3.2,-5) (-2/11,2

Answer 90

So it's

2-(-5)
------
-2/11 -(-3.2)

Answer 91

its this

Answer 92

R u sure u wrote the problem correctly? It's a really nasty number

Answer 93

i just sent you the image

Answer 94

Ok, so it's

11/2-(-5)
----------
-2-(-3/2)

Answer 95

yesss

Answer 96

Can u simplify the top and bottom?