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KC Cutie 09-11-2006 03:59 PM
Pre-Algebra Word Problems
 
I need help with a word problem. :confused: Any math people out there?

YORKIE7 09-11-2006 04:02 PM
What is it?, i will try and help :)

JESSY_RN2B 09-11-2006 04:12 PM
I can give it a shot too..........

Kona 09-11-2006 04:54 PM
Send it over

KC Cutie 09-11-2006 05:02 PM
A rental car with 300 miles for $24.
60 cents for each additional mile.
If I have $32, how far can I go?

I just need to know how to write the equation for the above.


Also, on exponents, if you have 10^8 - 5^4, do you subtract the powers?

Thanks for any help!!! :)

Lacy's Mom 09-11-2006 06:45 PM
I can't think of a single equation for the first one. It seems like you would need two parts such as:

(32 - 24) = .60x *
(32-24) divided by .60 = x (changed .60 sides so did the opposite)
8 divided by .60 = x
13.333333 = x

* you would need parenthesis here to follow the rules of order (P,E,M,D,A,S)
Please (paren) Excuse (eponents) My (multi) Dear (div) Aunt (add) Sally (sub)

Then,

x plus 300 = y
13.33333 plus 300 = y
313.33333 = y

The exponent problem I don't see any way to simplify the equation since the bases are different.

10^8 - 5^4 = X
100,000,000 - 625 = 99,999,375

txshopper73 09-11-2006 06:47 PM
Quote:
Originally Posted by Lacy's Mom
I can't think of a single equation for the first one. It seems like you would need two parts such as:

(32 - 24) = .60x *
(32-24) divided by .60 = x (changed .60 sides so did the opposite)
8 divided by .60 = x
13.333333 = x

* you would need parenthesis here to follow the rules of order (P,E,M,D,A,S)
Please (paren) Excuse (eponents) My (multi) Dear (div) Aunt (add) Sally (sub)

Then,

x plus 300 = y
13.33333 plus 300 = y
313.33333 = y

The exponent problem I don't see any way to simplify the equation since the bases are different.

10^8 - 5^4 = X
100,000,000 - 625 = 99,999,375
Holy moses! I'm so lost!!!!!

Patti 09-11-2006 07:30 PM
Wow, they must have changed Math since I went to school!!!!!

RoxyJosMom 09-11-2006 07:55 PM
Quote:
Originally Posted by Patti
Wow, they must have changed Math since I went to school!!!!!
Wow, I guess they did!! I always got the answer my own way then worked backwards to get the formula. The last one lost me and I went to college.:D Of course, it was a party college and back when we had to ride dinosaurs to class. Anyone try to stay on a dinosaur with a hangover??? (not the dino, me :D :D :D ).

Lacy's Mom 09-11-2006 10:22 PM
Did you also notice the title "Pre-Algebra"! Geez, my kids were taking Calculus before they graduated from high school. They were even receiving college credits for a lot of the courses they took.

ButterflyYorkie 09-11-2006 11:00 PM
Quote:
Originally Posted by Lacy's Mom
Did you also notice the title "Pre-Algebra"! Geez, my kids were taking Calculus before they graduated from high school. They were even receiving college credits for a lot of the courses they took.
Yeah! My daughter is in the 4th grade and she's already getting these kind of problems! Half of her math book this year is pre-Al. Gosh. I'm in trouble. Thank goodness she's actually pretty good at it cause Mama here isn't.:D

JESSY_RN2B 09-12-2006 02:28 AM
I got 180 miles :)

I don't know if I am correct though

JESSY_RN2B 09-12-2006 02:37 AM
Quote:
Originally Posted by KC Cutie
A rental car with 300 miles for $24.
60 cents for each additional mile.
If I have $32, how far can I go?

I just need to know how to write the equation for the above.


Also, on exponents, if you have 10^8 - 5^4, do you subtract the powers?

Thanks for any help!!! :)
300/24 = 12.5

$32-$24 = 8

So you have $8 to which you multiply the 60 cents to and get = 8.00 x .60 = 4.8 move the decimal over or just multiply 8 x 60=480

Now 480 miles minus the 300 = 180 ;)

0liversMom 09-12-2006 04:14 AM
Way-to-go, Lacey's Mom! I did the math, and came up with the same thing you did. :p

0liversMom 09-12-2006 04:18 AM
Just for curiosity sake, I'm giving this one to my son (9th grader) as soon as he gets home from school today. lol. ...He should know this stuff, especially since he's been getting these types of problems the past few years, but we'll see. lol. You know kids, he'll probably tell me he has no idea!

KC Cutie 09-12-2006 05:23 AM
Thanks for the input, guys. I was close....I guess. ha This is what I came up with. (Actually, one of several equations I came up with....don't know which is correct, though. ha I hate math!!!)

24 + .60x = 32

24 - 24 + .60x = 32 - 24

.60x = 8

.60x / .60 = 8 / .60

x = 7.5

300 + 7.5 = 307.50 miles

Ponyup 09-12-2006 05:56 AM
Quote:
Originally Posted by KC Cutie
Thanks for the input, guys. I was close....I guess. ha This is what I came up with. (Actually, one of several equations I came up with....don't know which is correct, though. ha I hate math!!!)

24 + .60x = 32

24 - 24 + .60x = 32 - 24

.60x = 8

.60x / .60 = 8 / .60

x = 7.5

300 + 7.5 = 307.50 miles
Hey, I actually think you are right. If you look at the problem you are only paying 0.08/mile for the first 300mile after that it's .60. Your formula looks right to me.

I wish I could remember how to do the powers. There should be a chapter explaining that in your book it should have examples & be very clear.

KC Cutie 09-12-2006 06:53 AM
Thanks! I hope it is correct. I'll find out tonight. I've been stressing over this paper all week. :rolleyes:

This is only pre-algebra! What am I going to do when I get to the real classes?!! :eek: I am beginning to question my decision to go back to school! What was I thinking?!

Lacy's Mom 09-12-2006 07:12 AM
Good luck! Please post back the correct answer so we can all stop thinking about it!

Oliver's Mom's got a good idea, ask a high schooler, it's normal math to them!

KC Cutie,
7.50 miles at .60 mile would cost you 4.50 (4.20 for 7 miles, plus .30 for the 1/2 mile) and you have $8.00 to spend, so sorry your computation isn't correct. Always work the problem backwards - we ususally know the answer, but just don't know how we got it.

mrs. chris 09-12-2006 07:12 AM
Quote:
Originally Posted by ButterflyYorkie
Yeah! My daughter is in the 4th grade and she's already getting these kind of problems! Half of her math book this year is pre-Al. Gosh. I'm in trouble. Thank goodness she's actually pretty good at it cause Mama here isn't.:D
i'm with ya on that...my daughter is in 5th grade and comes home with stuff that makes me go cross-eyed just looking at it!!! my hubby took a math class in college last year and couldn't figure out how to solve a problem...my dtr just breezes thru the room and said "daddy you are doing that all wrong, this is the answer" and she was right!!! good thing she's smart in math cuz her momma couldn't add her way out of a wet paper bag!!!:rolleyes:

Hickey007 09-12-2006 07:39 AM
Quote:
Originally Posted by KC Cutie
Thanks for the input, guys. I was close....I guess. ha This is what I came up with. (Actually, one of several equations I came up with....don't know which is correct, though. ha I hate math!!!)

24 + .60x = 32

24 - 24 + .60x = 32 - 24

.60x = 8

.60x / .60 = 8 / .60

x = 7.5

300 + 7.5 = 307.50 miles

I think your algebra looks fine here, the equation itself looks fine. I'm thinking though that going from your 4th to 5th line that you made a mistake in your math(I could be doing something wrong myself though). I think 8/.6 is 13.333 not 7.5.

Before seeing your answer I did it like this
300+ (32-24)/.60 = X which is basically the same thing as yours just written in a diff order, but when you work it out it because of the orders of operation is it worked in the same order.

KC Cutie 09-12-2006 07:40 AM
Quote:
Originally Posted by Lacy's Mom
Good luck! Please post back the correct answer so we can all stop thinking about it!

Oliver's Mom's got a good idea, ask a high schooler, it's normal math to them!

KC Cutie,
7.50 miles at .60 mile would cost you 4.50 (4.20 for 7 miles, plus .30 for the 1/2 mile) and you have $8.00 to spend, so sorry your computation isn't correct. Always work the problem backwards - we ususally know the answer, but just don't know how we got it.

Oh boy! Thanks for the reply. Back to the drawing board. This will give me something to do during my lunch hour. ha

Lacy's Mom 09-12-2006 07:59 AM
Look at Hickey's reply - I just looked at your answer and knew it wasn't right, but 8 divided by .60 is 13.33333 not 7.50 so maybe it was just a math error. I'll take a look at your equation again.

I looked, your equation was just fine, just a small error in simple division! You've got it!

KC Cutie 09-12-2006 08:31 AM
Phew. Thanks for everything guys!! :D

BamaFan121s 09-12-2006 09:02 AM
Quote:
Originally Posted by txshopper73
Holy moses! I'm so lost!!!!!
Nah, you're not lost, you're sitting right beside me.:D

bkessler 09-12-2006 04:36 PM
:lol tears This is why I am a gym teacher and not a math teacher!! LOL


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