Math question help

[BHC Vic]

I don’t know if I’m tired or what but can someone explain why… what did we do to one side to get here or how did we get here. It’s question 9. In probably over thinking it but I’m getting pissed off now.

I’d rather be packing for the trip and that’s probably the biggest issue here

 

[shintoooo]

the atmospheric concentration of benzene is 9.2 ppm and the mw of benzene is 78. what is the concentration in mg/m^3 - Google Search

1. 
   Step 1…Substitute the given values into the formula.
   • mg/m3=(ppm)⋅molecular weight24.45mg/m cubed equals open paren ppm close paren center dot the fraction with numerator molecular weight and denominator 24.45 end-fraction
   • mg/m3=9.2⋅7824.45mg/m cubed equals 9.2 center dot 78 over 24.45 end-fraction
   
   Step 2…Calculate the concentration.
   • mg/m3=9.2⋅7824.45mg/m cubed equals 9.2 center dot 78 over 24.45 end-fraction
   • mg/m3≈29.2mg/m3mg/m cubed is approximately equal to 29.2 space m g / m cubed

• 
  Understanding Units of Measurement - gov.epa.cfpub
  The molecular weight of benzene is 78. If the concentration of benzene in air is 10 mg/m3, convert to the units of ppm by multiply...
  
  

Solution
The concentration of benzene is approximately
29.2mg/m329.2 space m g / m cubed
.

 

[BHC Vic]

fuck my life

 

[96motorhead]

First you need to understand that whatever you do to one side of the equation must be done to the opposite side to keep the entire equation balanced.

- multiplication will undo division
- division will undo multiplication

1. Multiply both sides by MW, this will give you MW*ppm = (mg/m^3)*24.45
2. Divide both sides by 24.45, this will give you (MW*ppm)/24.45 = mg/m^3

If you just want to cheat the system you can just plug in the answers and see which one gives you 9.2, that will be the correct answer.

 

[rivermobster]

fuck my life

Jezuz dude...

Tell me you don't know how to use ChatGPT, without telling me you don't know how to use ChatGPT?

 

[BHC Vic]

First you need to understand that whatever you do to one side of the equation must be done to the opposite side to keep the entire equation balanced.

- multiplication will undo division
- division will undo multiplication

1. Multiply both sides by MW, this will give you MW*ppm = (mg/m^3)*24.45
2. Divide both sides by 24.45, this will give you (MW*ppm)/24.45 = mg/m^3

If you just want to cheat the system you can just plug in the answers and see which one gives you 9.2, that will be the correct answer.

Thank you. This helped, I got it now.

 

[Sharky]

42

 

[lbhsbz]

I got 28.2, so I picked the correct the answer because it was closest...lol

 

[lbhsbz]

Jezuz dude...

Tell me you don't know how to use ChatGPT, without telling me you don't know how to use ChatGPT?

Tell me you don't know how to use your own brain without telling me you don't know how to use your own brain.

Did Chat GPT tell you to put a question mark at the end of that sentence?

 

[Riley1]

9.2 x 78 = 717.6

717.6 / 24.45 = 29.34969325153374

 

[rivermobster]

Tell me you don't know how to use your own brain without telling me you don't know how to use your own brain.

Did Chat GPT tell you to put a question mark at the end of that sentence?

My brain does NOT do math!!!

 

[SkyDirtWaterguy]

 

[lbhsbz]

9.2 x 78 = 717.6

717.6 / 24.45 = 29.34969325153374

Damn it...musta miskeyed something. Ran through my numbers again and came up same as you.

 

[adam909]

Is the answer to number 11. 70 dba?

 

[Fun Times]

 

[Sandlord]

A)

 

[SkyDirtWaterguy]

 

[BHC Vic]

Is the answer to number 11. 70 dba?

89

 

[ChumpChange]

 

[HTTP404]

You going to meth making school or some shit?

 

[JL95]

Can you fill my test out too? Lol I need to get that cert fr fr

 

[Vamodsquad]

Maff is hard !

 

[LazyLavey]

Maybe you haven't heard...


MATH IS RACIST

 

[TPC]

Anything from removing a seized broken stud on a Ford V6 block. To using KY jell or oil, to complex math equations,, you’ll find the answer on RDP.

 

[sonicss31]

Ok, am I the only that doesn’t understand the question or answer?

 

[BHC Vic]

Anything from removing a seized broken stud on a Ford V6 block. To using KY jell or oil, to complex math equations,, you’ll find the answer on RDP.

I knew someone would be able to help me understand it. I knew I had to do the same thing to both sides I just wasn’t sure how to isolate what I wanted

 

[240Hallett]

Ok, am I the only that doesn’t understand the question or answer?

No

 

[rivermobster]

Ok, am I the only that doesn’t understand the question or answer?

You are definitely not alone. I have no clue what's going on here.

Yet...

I'm sure for some people it's as simple as tying a dock line to a cleat!

Different stroke for different folks.

 

[Captain Dan]

And you might hear yourself say: I'll never need to know algebra. Guess what?

 

[rivermobster]

And you might hear yourself say: I'll never need to know algebra. Guess what?

You do realize most of the world progressed past a pencil and paper a long time ago right?

https://www.officedepot.com/a/products/944889/Texas-Instruments-TI-36X-Pro-Scientific/?utm_source=google&utm_medium=sag?utm_source=google&utm_medium=cpc&utm_campaign=pla_cor_evg_supplies-new_general_unid_prch_non-match&mediacampaignid=71700000119141380&utm_source=google&utm_medium=cpc&gad_source=1&gclid=Cj0KCQiAvbm7BhC5ARIsAFjwNHvlGcUXydgYPKdOOVg1dDmj-4BU7Li31MgaMvReDJ5drkKk28NGCoMaArL0EALw_wcB&gclsrc=aw.ds

 

[Terminal Velocity]

I don’t know if I’m tired or what but can someone explain why… what did we do to one side to get here or how did we get here. It’s question 9. In probably over thinking it but I’m getting pissed off now. View attachment 1463666 View attachment 1463667
I’d rather be packing for the trip and that’s probably the biggest issue here

my pea brain, just plugged in each ( A - D) and did the equation (as it also gave the MW) until it gave me the ppm answer that was in the original question.

 

[Captain Dan]

You do realize most of the world progressed past a pencil and paper a long time ago right?

Almost 40 years as a Professional Engineer. I've always said if you can't do it by hand, you have no business doing it with a calculator.

 

[BHC Vic]

You do realize most of the world progressed past a pencil and paper a long time ago right?

View attachment 1463924

https://www.officedepot.com/a/products/944889/Texas-Instruments-TI-36X-Pro-Scientific/?utm_source=google&utm_medium=sag?utm_source=google&utm_medium=cpc&utm_campaign=pla_cor_evg_supplies-new_general_unid_prch_non-match&mediacampaignid=71700000119141380&utm_source=google&utm_medium=cpc&gad_source=1&gclid=Cj0KCQiAvbm7BhC5ARIsAFjwNHvlGcUXydgYPKdOOVg1dDmj-4BU7Li31MgaMvReDJ5drkKk28NGCoMaArL0EALw_wcB&gclsrc=aw.ds

I think I need the t85 for this test

 

[BHC Vic]

Almost 40 years as a Professional Engineer. I've always said if you can't do it by hand, you have no business doing it with a calculator.

That’s why I wanted someone to explain it to me. I’m not 100% sure we get to use a calc. I’m feeling pretty confident today though. Just aced the practice test. I

 

[Captain Dan]

That’s why I wanted someone to explain it to me. I’m not 100% sure we get to use a calc. I’m feeling pretty confident today though. Just aced the practice test. I

Good for you, I hope you do well.

 

[Bigbore500r]

Jezuz dude...

Tell me you don't know how to use ChatGPT, without telling me you don't know how to use ChatGPT?

Maybe he wants to actually learn the subject

 

[BHC Vic]

 

[2Driver]

Whats benzene?

 

[rivermobster]

Almost 40 years as a Professional Engineer. I've always said if you can't do it by hand, you have no business doing it with a calculator.

An engineer eh?

Wouldn't that be like saying...

If you can't remove a lug nut by hand, you have no business using an impact? How do you think that would play out on an earth moving machine?

Almost every tool out there, from a calculator to drill motor, was designed to make someone's life easier.

I like easy. Especially when it comes to women.

Full disclosure: I couldn't do algebra even With a calculator! Did I mention I hate math??

 

[rrrr]

Almost 40 years as a Professional Engineer. I've always said if you can't do it by hand, you have no business doing it with a calculator.

I'm not an engineer, but as a tradeoff I have a personality.

 

[Captain Dan]

I'm not an engineer, but as a tradeoff I have a personality.

Tough crowd, but then again it's RDP and the torches could come out at any given time....

 

[lbhsbz]

I knew someone would be able to help me understand it. I knew I had to do the same thing to both sides I just wasn’t sure how to isolate what I wanted

The original equation had mg/cubic mm (ccs) so I just called that "Y" and re-wrote it....that way you don't get hung up with exponents doings the PEMDAS thing.

Then it gets relatively simple....unless you're a Ford or Union guy I guess....maybe if Ford and Union guys tried breathing through their noses math wouldn't be so hard. lol

 

[TPC]

I'm not an engineer, but as a tradeoff I have a personality.

I asked Maynard if any dateable girls are at his company.
"No, They're all engineering girls."

 

[JL95]

@BHC Vic I am going to do this first quarter, did you buy a study guide or books? Looking like that is the best bet.

 

[RVR_RCN]

Meanwhile, the rest of us

 

[RadMan]

After reading all this,
I feel further from the truth.

 

[BHC Vic]

@BHC Vic I am going to do this first quarter, did you buy a study guide or books? Looking like that is the best bet.

Yea I can try to send you what I have when I get back toOntario. Helped a lot actually are you doing Stsc or CHST I have some stuff I can email from here

 

[JL95]

Yea I can try to send you what I have when I get back toOntario. Helped a lot actually are you doing Stsc or CHST I have some stuff I can email from here

I just bought the SPAN book on ebay. Anything else would be helpful. How tough was it?

 

[BHC Vic]

I just bought the SPAN book on ebay. Anything else would be helpful. How tough was it?

I used click safety and momentix or whatever it’s called. I can email you the second one digital the click safety is a book but I could probably scan it and make digital

 

[JL95]

I used click safety and momentix or whatever it’s called. I can email you the second one digital the click safety is a book but I could probably scan it and make digital

Thank you very much. I'll PM you.