More 8th Grade Math

"ttyymmnn" (ttyymmnn) 09/15/2016 at 17:08 • Filed to: None

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I suck at motion problems.

Natalie and Hope are racing on a track. Natalie runs 4 miles per hour and gets a 0.25 mile head start. Hope runs 0.5 miles per hour faster than Natalie. If Natalie and Hope run the same distance, how many hours, x, do they run?

Takuro Spirit > ttyymmnn 09/15/2016 at 17:14

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I need to know how many turns this track has, and how much of a NASCAR fan Hope is.

Hope sounds like a NASCAR fan.

unclevanos (Ovaltine Jenkins) > ttyymmnn 09/15/2016 at 17:17

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Solve the following IVP

ttyymmnn > Takuro Spirit 09/15/2016 at 17:17

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I have no idea, but I like to imagine that this is Hope.

Chuckles > ttyymmnn 09/15/2016 at 17:18

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So let x equal the number of hours. Natalie runs 4x+ 0.25, and Hope runs 4.5x. Set these equal to each other and solve for x

ttyymmnn > unclevanos (Ovaltine Jenkins) 09/15/2016 at 17:18

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Takuro Spirit > ttyymmnn 09/15/2016 at 17:20

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MAN I miss Middle School.

ttyymmnn > Chuckles 09/15/2016 at 17:21

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That I can do. I hadn’t made the leap to 4.5x.

Thanks.

Montalvo > ttyymmnn 09/15/2016 at 17:21

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4X + .25 = 4.5X

Subtract the 4x from both sides

.25 = .5X

Divide both sides by .5

.5 = X

So they ran for half an hour

Daily Drives a Dragon - One Last Lap > ttyymmnn 09/15/2016 at 17:21

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4x + .25 = 4.5x

I think it’s setting the two rates equal to each other but, I may be entirely wrong.

Chuckles > ttyymmnn 09/15/2016 at 17:23

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No problem

ttyymmnn > Daily Drives a Dragon - One Last Lap 09/15/2016 at 17:23

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That looks right, and somebody else said the same thing. I hadn’t made the leap to 4.5x to account for the faster speed. I’m gonna fail MS math. And I’ll likely take my son down with me.

ttyymmnn > Montalvo 09/15/2016 at 17:24

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I can solve it, I just couldn’t set up the equality. Thanks.

ttyymmnn > Chuckles 09/15/2016 at 17:24

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Is that a pun?

Chuckles > ttyymmnn 09/15/2016 at 17:28

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Haha. It wasn’t intentional.

ttyymmnn > Chuckles 09/15/2016 at 17:30

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The best kind.

The Stig's former college room mate > ttyymmnn 09/15/2016 at 17:32

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That kids reaction is priceless

Daily Drives a Dragon - One Last Lap > ttyymmnn 09/15/2016 at 17:33

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Don’t worry. You have OPPO.

Highlander-Datsuns are Forever > ttyymmnn 09/15/2016 at 17:38

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This is how I read word problems. “If a train poops in the woods did the chicken cross the road?”

ttyymmnn > Daily Drives a Dragon - One Last Lap 09/15/2016 at 17:40

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I do. And my son also has an uncle who teaches 7th grade math. But he lives in CA.

ttyymmnn > The Stig's former college room mate 09/15/2016 at 17:40

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The kid was added in post. He wasn’t there in the original video. That’s the only one I could find quickly.

ttyymmnn > Montalvo 09/15/2016 at 17:48

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Okay, here’s another one:

Drew and Will each began saving money for a new computer. Drew saves $5 per week plus $50 he receives for his birthday. Will saves $7 per week. Write an inequality to find w , the number of weeks until Will has saved at least the same amount as Drew.

It’s the inequality bit that is throwing me off here. Thanks in advance.

vicali > ttyymmnn 09/15/2016 at 17:50

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running is hard

ttyymmnn > vicali 09/15/2016 at 17:55

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Math is harder.

Hot Takes Salesman > ttyymmnn 09/15/2016 at 18:07

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5w+50=7w (w is the weeks at which they are equal)

Subtract 5w from each side

50=2w

w=25

The amount of money collected at that point by each party was $175.

ttyymmnn > Hot Takes Salesman 09/15/2016 at 18:12

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I got that, but the problem specifically asked for an inequality . Is this the same thing?

XJDano > ttyymmnn 09/15/2016 at 18:26

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There is a catch.

SHOW YOUR WORK.

Haha. I remember those. Although I haven't done it in forever, I could likely do middle school math. My daughter is in Kindergarten and my wife is bad at math. I hope Oppo is around for calculus when the time comes.

ttyymmnn > XJDano 09/15/2016 at 18:29

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Oppo’s gonna save my ass when he gets to HS.

XJDano > Highlander-Datsuns are Forever 09/15/2016 at 18:29

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3 hours.

Hot Takes Salesman > ttyymmnn 09/15/2016 at 18:31

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Hm.

7w is greater than or equal to 5w+50

w is greater than or equal to 25

I’m doing algebra in school now. So help me god.

NJAnon > ttyymmnn 09/15/2016 at 19:33

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I can’t help you ttyymmnn. I was only “slightly” good at geometry. Meaning that geometry was the only math class where the teacher didn’t give me the look of “you’re gonna suck at adult life kid” when I turned in test papers. :P

ttyymmnn > NJAnon 09/15/2016 at 19:39

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I'm a professional musician and, as such, I inly have to count to three.