Question

http://prntscr.com/b3cqtk

Can someone please explain how the heck to do this. My teacher said to look up tires and find their circumference. I found tires, but I can't find their circumferences anywhere, and since the tires aren't physically here I have no way of measuring them. I have no idea what to do. Any advice?

Answer 1

https://www.pepboys.com/tire_type/

I'm using this site, but the circumference I can't find.

Answer 2

@zepdrix
@jhonyy9

Answer 3

I know circumference of circle is pi times the diameter or 2pidiameter, but I don't know how to find the circumference if I can't find where it's listed online.

She wants me to name the tires and their circumference, but I can't find their circumference and I haven't been able to find a sit that has the circumference of their tires yet.

Answer 4

I guess we'll have to find a list of tires with diameters included if we can't directly find circumference.

Sec... checking that site :d

Answer 5

That's what I thought haha. I've been looking for so long, I've come here to find people to help me find tires LOL.

Though, there is actually a few math questions I need help with. Though, right now, I gotta fine tired to use.

Answer 6

Ah ok, here we go,
we can search by size
https://www.pepboys.com/tires/sbs?iCID=all-terrain-tires-lp_tires_01-12-2016_shop-tires-by-size_tires:sbs_button
see the three drop down boxes?
the third one is diameter in inches.

Answer 7

So if we choose a 17 inch tire,
and click next,

we should get a list of available tires with that measurement at your local store or something. We really just need the name of the tire though so we can write it on our list.

Answer 8

Ah, so we can just make a tire up ourselves?

Answer 9

Would a 17 inch tire be 17 inches in height or?

Answer 10

Oh they want you to include a variety of vehicles.
So we can do something as simple as a bike or anything else.

Answer 11

17 refers to the `diameter` of the tire, in inches.

Answer 12

Sounds good to me!

Alright so how about this

Bike tire 13 inches in diameter
Car tire 17 inches in diameter
Scooter tire 10 inches in diameter

Does that work?

Answer 13

Well they don't care about the diameters,
so we won't list those on our chart.

We'll use that diameter information to calculate the circumference of each.

So for the car: \(\large\rm C=\pi(d)=\pi(17)\)

Bike tires are usually really big,
I would go with something like 23 inch or whatever :D
I guess it doesn't matter lol

Answer 14

Alright!

Car tire with circumference 53.4
Bike tire with circumference 72.22
Scooter tire with circumference 31.4

This is the next question
http://prntscr.com/b3cxfa

Answer 15

There's 6 questions left, but they're all very short, so don't leave me. xc

Answer 16

I mean, after that one there will be five haha.

Answer 17

if you were to take the distance around the tire, the circumference, and lay it flat on the road

Answer 18

You simply need to take the full 10000 and divide it by the 53.4 to determine how many full tire circumferences it would take to cover the road.

Answer 19

I got 18.7 for the car tire
I got 13.8 for the bike tire
I got 31.8 for scooter tire correct?

Answer 20

I think you accidentally used 1000

Answer 21

DANG

Alright, I'll fix it.

This is the fifth question.

http://prntscr.com/b3d0sh

I will use the scooter. My teacher said this.

If you do not drive, or your family does not travel much during the week, use "40 miles per day".

Answer 22

Fourth actually.

Answer 23

Don't use the scooter if you're going to use "40 miles per day".
No one "scoots" for 40 miles in a day :) that's insane lol

Answer 24

Err I guess if it's a motorized scooter they might,
ok ok ignore what I was saying :D

Answer 25

40 for every day?
That seems so boring.

It's probably better to make up some data.

So let's say you scoot for 50 miles on day 1.
50/31.4 = 1.6 rotations.

Maybe you scoot for 30 miles on day 2.
30/31.4 = 1.0 rotations.

And so on.

Make up some numbers :D

Answer 26

LOL, alright.

Also, I got the new nubers.

I got, 187.2,138.4, and 318.4.

Answer 27

Ok good good good, those look better.

Answer 28

138.5* round correctly :)

Answer 29

Then I just add up the numbers and divide by the number of days to get the average?

This is the next question.
http://prntscr.com/b3d301

Third question.

Answer 30

What?
This question makes no sense.
Our data didn't tell us anything about the life of the tire.

Answer 31

Ya, this one I dunno :( no bueno

Answer 32

Yeah, that's why I'm having such a hard time. I already have reading comprehension issues, so these questions are kinda screwing me up. xc

This might help you. My teacher said this

Calculate a prediction of when these specific tires will need to be rotated (after 10,000 miles). Remember to show work.

Answer 33

Ok. So remember that earlier we concluded the car would travel 10000 miles after 187.2 rotations.

So take this 187.2 rotations,
and divide it by your average daily rotations.

This will give us the number of days it takes to travel 10000 miles in the car.

Answer 34

I got 0.05 for the average with these numbers
http://prntscr.com/b3d62v

Not sure if I did the average right

Reading what ou said now

Answer 35

Alright! I filled in the data, but I'm not sure if my average is correct.

I understand what you're saying though.

Answer 36

I'm not sure why you're dividing by 318.4 hmm..