Algebra Word Problem

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thread starter tunaonshoe Jul 10 2009 + PM | QUOTE | PERMALINK | REPORT

Why is zero to the zeroth power 1 if anything over divided by 0 is undefined and that when anything over itself is 1 but 0/0 =/= 1?

HolyMythos Jul 10 2009 + PM | QUOTE | PERMALINK | REPORT

tunaonshoe said: "A concession stand made $1,432 selling jumbo hotdogs and regular hotdogs. Jumbo hotdogs are $5 and regular hotdogs are $2 less. They sold 400 hotdogs today. How many of each hotdog did they sell?" The HolyMythos way: Multiply 400 by $5 to get $2000 Subtract $3 from $5 ($3 being the price of a regular hotdog), you get $2 Subtract $1,432 from $2,000, you get $568 Divide $568 by 2, you get 284 You have 284 regular and 116 jumbo. Someone check it. Check: 116 x 5 = 580 (284 x 3) + 580 = 1432 I'm god.

tunaonshoe Jul 10 2009 + PM | QUOTE | PERMALINK | REPORT

Why do you do that though? I stared at this problem and nothing I learned in algebra taught me how to do this. In 5 hours I have my final exam which I'm most likely gonna fail since I don't know any of the material! Why the 5, why not 3? Is there some kinda cross multiplying involved?

chaozd3mon 07/10/09 + PM | QUOTE | PERMALINK | REPORT

The ChaozD3mon's way let jumbo dog = x, and regular = y 5x + 3y = 1432 ........ 1 x + y = 400 ...... 2 then do simutaneous equation, sub 2 into 1 5(400 - y) + 3y = 1432 2y = 568 y = 284 then sub y = 284 into equation 1 or 2, sub y = 284 into 2 x + 284 = 400 x = 116

yoshidude65 07/10/09 + PM | QUOTE | PERMALINK | REPORT

Let J = Jumbo Hot Dog and R = regular hot dog. So: J + R = 400 (the number sold) and 5J + 3R = 1432 (the money collected). So then R = 400 - J. Then 5J + 3(400-J) = 1432. Just solve for J

HolyMythos 07/10/09 + PM | QUOTE | PERMALINK | REPORT

tunaonshoe said: "Why do you do that though? I stared at this problem and nothing I learned in algebra taught me how to do this. In 5 hours I have my final exam which I'm most likely gonna fail since I don't know any of the material!" I'm very good at math problems: The most they can make is $2,000 by selling 400 $5 hotdogs. know the smaller hotdogs are $3 since they are $2 less than the $5 one. Now, for each regular hotdog they sell instead of a jumbo one, they lose two dollars: (399 x 5) + (1 x 3) = 1998 We know this because it says the regular hotdogs are $2 less, meaning there's a two dollar difference. Now that we know all of this, we take the difference between the highest amount they can make ($2000) and the money they actually made ($1432). The difference is 568. Since we know the difference between a large hotdog and a regular hotdog is $2, we just divide the difference of the totals (568) by 2. This will give us the amount of regular hotdogs (284). Now subtract 284 from 400, and you get the amount of large hotdogs (132). To check, simply do this: 132 x 5 = ? 284 x 3 = ? ? + ? = 1432

heinous Jul 10 2009 + PM | QUOTE | PERMALINK | REPORT

er. It's something called system of equations. you make two equations, for this problem, you'd do this: j+r=400 J is the jumbo hotdog and r is the regular hotdog. When you add them together you get 400 hotdogs in total The second equation would be: 5j+3r=1432 You get the cost and make it the coefficent of the j and r to make the second equation. So, now the system is j+r=400 5j+3r=1432 Take the first equation and solve for one variable, it doesn't matter which, I'll do r. j=400-r* Plug it into the second equation 5(400-r*)+3r=1432 2000-5r+3r=1432 -2r=-568 r=284 Plug this back into the equation j+r=400 j+289(that's the r)=400 and you're done.

HolyMythos 07/10/09 + PM | QUOTE | PERMALINK | REPORT

The way they did it is using equations that basically do the same thing as what I told you. If you don't understand the equations, my way will explain them.

tunaonshoe Jul 10 2009 + PM | QUOTE | PERMALINK | REPORT

then do simutaneous equation, sub 2 into 1 5(400 - y) + 3y = 1432 2y = 568 y = 284 then sub y = 284 into equation 1 or 2, sub y = 284 into 2 x + 284 = 400 x = 116

nigelzhang Jul 10 2009 + PM | QUOTE | PERMALINK | REPORT

oopsie daisy

HolyMythos 07/10/09 + PM | QUOTE | PERMALINK | REPORT

nigelzhang said: "5x+3x=1432 x=179 5(179)=895 jumbo hot dogs" Because 895<400

heinous 07/10/09 + PM | QUOTE | PERMALINK | REPORT

tunaonshoe said: "[quote]then do simutaneous equation, sub 2 into 1 5(400 - y) + 3y = 1432 2y = 568 y = 284 then sub y = 284 into equation 1 or 2, sub y = 284 into 2 x + 284 = 400 x = 116 Did you do that because you had to isolate the x in x+y=400 by bring the y over? Then you plugged it in ? Can you guys give me a 5 hour crash course on algebra or I will fail ._. I got 20 more topics I don't understand so.... D:" Yes.

PureLabel 07/10/09 + PM | QUOTE | PERMALINK | REPORT

Your pretty smart HolyMythos

tunaonshoe 07/10/09 + PM | QUOTE | PERMALINK | REPORT

Okay now imagine a table x|-3|0|3|6|9|12|15 y| 1|3|5|7|9|11|13 What word describes the function in this table and explain my reasoning. A)Linear B)Quadratic C)Exponential D)Power I chose B cause I remember something by the difference of the difference of y being 2, its quadratic from pre algebra and they didn't teach thsi to me, so idk. And Why is it that I have to take alg in summer class when you guys can take alg in 7th grade in the super 48 state jumbo thing.

HolyMythos 07/10/09 + PM | QUOTE | PERMALINK | REPORT

PureLabel said: "Your pretty smart HolyMythos" I have a little controllable highly functioning autism, it comes out when I have to do math problems =D