A community for students.
Here's the question you clicked on:
 0 viewing
 2 years ago
Help!? PLEASE! Screenshot attached! 2 questions! 1 question answered! ONE TO GO!
 2 years ago
Help!? PLEASE! Screenshot attached! 2 questions! 1 question answered! ONE TO GO!

This Question is Closed

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.15 people means 3.6 seconds so y people will be t seconds we can show it this way : dw:1350566474324:dw

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1now cross multiply and get the connection between y (number of people) and t (seconds)

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1and hey .. how are you ? :)

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1350566721091:dw

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1if you multiply one side by 100 you should multiply the other by 100 too

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1we need to isolate t from the equation that i gave you

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1no .. it's final answer is correct but i want you to be able to get it by yourself

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1there is no 75 in decart's answer :

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1\[\frac{ 5 }{ y } = \frac{ 3.6 }{ t }\] multiply both sides by \[y \times t\] we get: \[5t = 3.6y\] now divide both sides of the equation by 5 we get: \[t = \frac{ 3.6 }{ 5 } \times y\] which is the same as \[t=0.72y\]

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1yes sorry i was washing dishes lol

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1division of two fractions is like multiplying the first by the reciprocal of the second

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1\[\frac{ a }{ b } \div \frac{ c }{ d } = \frac{ a }{ b } \times \frac{ d }{ c }\]

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1so you can rewrite the problem as .. ?

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1no i just gave an example

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1you have to multiply the first fraction by the reciprocal of the second..

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1350568226013:dw

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1yes .. and changed the division to multiplication this his how you divide two fractions..

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1\[\frac{ (x^2x6)(x^2+5x+4) }{ (x^22x3)(x^2+x12) }\]

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1this is now what you have to simplify "so, do I multiply x^2 + x  12 by x^2 + 5x + 4 now? " no.. why you say that ?

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1\[\frac{ a }{ b } \neq a * b\]

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1we changed the division to multiplication because we divided FRACTION BY FRACTION

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1\[\frac{ 5 }{ 3 } * \frac{ 4 }{ 2 } = ?\]

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1right you just multiplied 5 with 4 and divided by the multiplication of 3 with 2

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1350569102823:dw

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1so same here .. after we changed the division into multiplication it's just multiplication of two fractions

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1you tell me .. how do we multiply those two fractions ?

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1i wont get mad why would i : look : \[\frac{ x^2x6 }{ x^22x3 } \times \frac{ x^2+5x+4 }{ x^2+x12 } = \frac{ (x^2x6)(x^2+5x+4) }{ (x^22x3)(x^2+x12) }\]

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1i dont know why you multiply numerator by denominator

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1this is what you get after the multiplication of the two fractions now we better factor every term than open the brackes like x^2x6 = x^23x+2x6 = x(x3)+2(x3) = (x+2)(x3)

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1yes look : whenever there is multiplication of two fractions you multiply numerator by numerator and denom by denom.. whenever there is division of two fractions you keep the first fraction as it is you change the division into multiplication but then for the second fraction you flip numerator and denominator and then you have multiplication of two fractions..

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1yes as i wrote up there

LCK
 2 years ago
Best ResponseYou've already chosen the best response.0I'll just to butt in for a bit, the general flow of fraction division goes like this: 1. Turn the division into a multiplication by inverting the second fraction 2. Factorise as much as possible and eliminate common terms. 3. Solve by multiplying the numerator by the numerator and denominator by denominator. Yes I wrote the same thing as cool sorry :/.

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1now it's better to factor every term than open the brackets .. so factoring x^2x6 gives = x^23x+2x6 = x(x3)+2(x3) = (x+2)(x3)

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1can you factor the rest of the terms ?

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1yes.. i just showed the way

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1you see my last expression is (x+2)(x3)

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1now factor the rest of the terms .. what do you get ?

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1so are you factoring the rest ?

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1good so how the expression looks like ?

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1after you change every term by it's factored form

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1you have to replace every term by it's factored from like replaceing " x^2  x 6" by " (x+2)(x3) " in the last expression

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1now you can eliminate some of them..

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1if you have the same thing in the numerator and in the denominator you can eliminate it ..

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1350571449666:dw

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1so what is left .. \[\frac{ x+2 }{ x3 }\]

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1i hope the next question of this kind will be easier for you now that you know the steps

Coolsector
 2 years ago
Best ResponseYou've already chosen the best response.1Im happy i could help you
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.