|
|
Rank: Hyper-Active Attention Gobbling Fuckwing
Groups: {pDs} Member, Registered User
Joined: 5/10/2006
Posts: 724
Points: 0
Location: CA
|
Algebra 2 questions: A speedboat travels at 4 times the speed of the current. It travels 425 miles downriver in two hours more than it took to travel 150 miles upriver. What was the speed of the boat in still water? In the current?  Fear the ING! -[Mr.]MaMa-*Bluecell*- -running -varmint
|
|
|
Rank: Fecal Impaction For the Win!
Groups: {pDs} Member
Joined: 5/9/2006
Posts: 1,724
Points: 6
Location: RVA
|
I think part of my brain just melted.. Bike wrote:I like to make werewolf movies. 
|
|
|
Rank: You're gonna stick that where?
Groups: Server Admin
Joined: 7/2/2006
Posts: 314
Points: 0
Location: Still here with my Beer!!!
|
|
|
|
Rank: Admiral OCD
Groups: {pDs} Member, Moderator, News Editor, Newsie
Joined: 5/9/2006
Posts: 3,491
Points: 1,346
Location: Parallel Universe
|
Hmm. I tried this for like five minutes, then realized you don't have any neighbors who are little. You slug. So, I'm going to think about it unless you find the answer on your own before I repost.
The trick to this problem is you have to account for the speed of the river. If the river is flowing at speed X, and the boat can go 4X, then when it goes downriver it's travelling at 5X and when it is going upriver, it's going at a speed of 3X, right, 4-1=3. Think of those moving walkways in airports.
Also, distance equals velocity times time: d=vt, where v equals 5X or 3X. Time is either t, or t-2 or t-2 and t, depending on which one of the equations you set as the time anchor. You solve for X using one of the equations solved for t.
Too much to do in my head at the moment. Try it and if you don't post here, I'll try it agian Sunday night.
You slug. You should be more like Cantrip.  Twitchy: "I pulled a Cantrip . . ." GivePeaceAChance: "If the Tempest had nipples, I'd pinch that shit." Xylicon: "I'm about to deliver my [Richard] in your face for posting that stupid shit. " WDF?: "He keeps reaming me... night after night... I'm rather sore." GivePeaceAChance: "OMG MY NIPS ARE HARD" llenta: "cantrip, you fail!!!" Filliam H. Muffman: "i'm on top of dick"
|
|
|
Rank: You're gonna stick that where?
Groups: {pDs} Member
Joined: 5/10/2006
Posts: 453
Points: 0
Location: Gaston, OR
|
Well I started off with what Cantrip said, with the following in mind 5x(t)=425 3x(t-2)=150 After working through it I realized that I didn't really like t-2 since it would theoretically exclude all values of t <2. So I changed it a bit 5(x)(t+2)=415 3(x)(t)=150 This allows numbers <2 to be valid for t. We need to get a value for one of the variables that we can put into one of the equations, since we are trying to find x here (speed) I solved for t initially. (3xt=150)/3x - divide by 3x to get rid of it on the left t=50/x - simplifies to 50/x Plug t into the first equation 5(x)((50/x)+2)=450 250+10x=450 - Distribute the 5(x) into the ((50/x)+2). Simplifies to 250+10x Solve for x, and you get 17.5 mph in the current that would be 5x, or 5(17.5), or 87.5 mph This can be verified by plugging the x value into both equations and seeing if it works. We know that it works in the 5x equation. When put into the 3x equation, it looks like this: 3(17.5)(50/17.5)=150 52.5(2.857....)=150 150=150 I hope its right...  AKA Shinobi Quote:Kick some giga-butt
|
|
|
Rank: Admiral OCD
Groups: {pDs} Member, Moderator, News Editor, Newsie
Joined: 5/9/2006
Posts: 3,491
Points: 1,346
Location: Parallel Universe
|
"After working through it I realized that I didn't really like t-2 since it would theoretically exclude all values of t <2. So I changed it a bit"
Nice. I think I'm in love.
I meant t and t-2 or t+2, and t, but the above shows that you're thinking and makes the math easier.
Math looks right. So the speed of the boat in still water is 4X. In the current it's 5X when going downstream and 3X going upstream, relative to the shore where x is the value Shizzle found in the above. However, relative to the boat in the water, from the perspective of the captain, it's still 4X going up or downstream -relative to the water. Remember the moving walkway above? If you walk on one, you still walk at walking pace going with and against the flow of the belt looking down at the belt. When you look to the sides, you see you're moving faster or slower than walking pace. Give all three answers.
Just wait until you start taking about General Relativity in your physics classes with speeds approaching the speed of light. Your d=vt equation gets beefed up. That's always fun. You should be more like Cantrip. Twitchy: "I pulled a Cantrip . . ." GivePeaceAChance: "If the Tempest had nipples, I'd pinch that shit." Xylicon: "I'm about to deliver my [Richard] in your face for posting that stupid shit. " WDF?: "He keeps reaming me... night after night... I'm rather sore." GivePeaceAChance: "OMG MY NIPS ARE HARD" llenta: "cantrip, you fail!!!" Filliam H. Muffman: "i'm on top of dick"
|
|
|
Rank: Fuckstick
Groups: {pDs} Member, Server Admin
Joined: 5/9/2006
Posts: 689
Points: 33
Location: Aomori, Japan
|
Braniacs! Dick Cheney's Mechanical Heart wrote:I wish I had some vicodin, it's been a long time. I remember the first time I took some vicodin for fun, it was like my whole body was a dick and god was blowing me.
|
|
|
Rank: Hyper-Active Attention Gobbling Fuckwing
Groups: {pDs} Member, Registered User
Joined: 5/10/2006
Posts: 724
Points: 0
Location: CA
|
Ok I wouldn't lie about this not being my homework. If I wanted you guys to do my homework, I would just say it out loud. My little neighbor really asked me this. This is seriously an Honors Algebra 1 Critical Thinking problem. Thanks for the help guys. Fear the ING! -[Mr.]MaMa-*Bluecell*- -running -varmint
|
|
|
Rank: Administration
Groups: {pDs} Member, Server Admin, WDFNews.com Official Mapper
Joined: 5/31/2006
Posts: 3,454
Points: 445
Location: Merryland
|
I thought you said Algebra 2  Cantrip wrote:When I die, I want to be reincarnated as a woman's jogging bra.
|
|
|
Rank: Hyper-Active Attention Gobbling Fuckwing
Groups: {pDs} Member, Registered User
Joined: 5/10/2006
Posts: 724
Points: 0
Location: CA
|
I meant 1 I take Calculus damnit. Fear the ING! -[Mr.]MaMa-*Bluecell*- -running -varmint
|
|
|
Rank: You're gonna stick that where?
Groups: {pDs} Member
Joined: 5/10/2006
Posts: 453
Points: 0
Location: Gaston, OR
|
MaMa wrote:I meant 1
I take Calculus damnit. Calculus requires the use of a shitload of Algebra, so you must have just been too lazy to do this then? AKA Shinobi Quote:Kick some giga-butt
|
|
|
Rank: Administration
Groups: {pDs} Member, Server Admin, WDFNews.com Official Mapper
Joined: 5/31/2006
Posts: 3,454
Points: 445
Location: Merryland
|
Dude I took honors algebra last year and i dont remember any of that shit. and yeah, why couldnt you do it lol. Cantrip wrote:When I die, I want to be reincarnated as a woman's jogging bra.
|
|
|
Rank: You're gonna stick that where?
Groups: Ogamer, Registered User
Joined: 8/4/2006
Posts: 157
Points: 0
Location: Canada
|
stealth wrote:I think part of my brain just melted.. Same D: {F - C} Gen.Laughlin: Oh god {F - C} Gen.Laughlin: Terible nate is reading as we speak {F - C} Gen.Laughlin: :O {F - C} Gen.Laughlin: Brb, Popcorn is ready {pDs} t3h Cam3l: hahaha 
|
|
|
Rank: Fecal Impaction For the Win!
Groups: {pDs} Member, Server Admin
Joined: 5/9/2006
Posts: 1,199
Points: 27
Location: Northern California
|
i remember that question from when i was in school, there are also questions like that on the SATs, annoying and take like 5 mins to think of which equation to use I am not an alcoholic... I am a drunk.... Alcoholics go to meetings. Grumpy wrote:WDF? wrote:Our ... is going up today, actually..... so... yeah... I'll section it. WARNING! Times mentioned in the above post are stated in WHUT time... which is not the time normal humans are accustomed. Whut time is relative. Today is defined as whenever Whut happens to get a bug up his ass and thinks he is gotten sorta of close to being in the mood. The actual real life timeframe for these occurences is unknown at this time. Sometimes it happens more than once in a day and during other periods it would be more like for hell to freeze over than anything actuallly getting done. Currently we are in a time frame where it would seem that there would be more of a chance of Dragon getting a girlfriend as far fetched as that might be than there would be of anything actually happening here.  -YourAimSucks -Reaper o'Blood -{pDs} Bloodhands
|
|
|
Rank: Hyper-Active Attention Gobbling Fuckwing
Groups: {pDs} Member, Registered User
Joined: 5/10/2006
Posts: 724
Points: 0
Location: CA
|
I did try it out, but I wasn't sure of my answers. I didn't want to give my neighbor the wrong answers. And yes, I did make a mistake. Fear the ING! -[Mr.]MaMa-*Bluecell*- -running -varmint
|
|
|
| Users browsing this topic |
|
Guest
|