Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    10
    ReputationRep:
    Two variables are connected by the relation: A∝1/B2.
    B is increased by 40%.
    Describe the change in A in percentage terms.
    • Thread Starter
    Offline

    10
    ReputationRep:
    (Original post by Rj2018)
    Two variables are connected by the relation: A∝1/B2.
    B is increased by 40%.
    Describe the change in A in percentage terms.
    Anybody?
    Offline

    8
    ReputationRep:
    wow you waited 3 minutes before posting "Anybody", such impatience.
    • Thread Starter
    Offline

    10
    ReputationRep:
    (Original post by wiseguy99)
    wow you waited 3 minutes before posting "Anybody", such impatience.
    It really is ngl
    • Thread Starter
    Offline

    10
    ReputationRep:
    Gonna try again, anyone???
    • Community Assistant
    • Welcome Squad
    Offline

    20
    ReputationRep:
    (Original post by Rj2018)
    Two variables are connected by the relation: A∝1/B2.
    B is increased by 40%.
    Describe the change in A in percentage terms.
    A \propto \frac{1}{B^2}? What's that '2' in your expression?

    Anywho, what does it actually mean for A to be proportional to that?
    Offline

    21
    ReputationRep:
    (Original post by Rj2018)
    Two variables are connected by the relation: A∝1/B2.
    B is increased by 40%.
    Describe the change in A in percentage terms.
    A \propto \frac{1}{B^2}

    We can rewrite this as:

    A=\frac{k}{B^2}

    What is the ratio of the values of A when B is multiplied by 1.4?
    Offline

    21
    ReputationRep:
    (Original post by RogerOxon)
    A \propto \frac{1}{B^2}

    We can rewrite this as:

    A=\frac{k}{B^2}

    What is the ratio of the values of A when B is multiplied by 1.4?
    Another way to look at this is:

    A\propto \frac{1}{B^2}

    \therefore \frac{A_1}{A_0}=\frac{\frac{1}{B  _1^2}}{\frac{1}{B_0^2}}=\frac{B_  0^2}{B_1^2}

    What is the ratio of the values of when is multiplied by (i.e. increased by 40%)?
    Offline

    1
    ReputationRep:
    .im gonna go ahead and say a is increased by 20% because idk it's just me saying random stuff don't dig at me 🤤
    Posted on the TSR App. Download from Apple or Google Play
    • Community Assistant
    • Welcome Squad
    Offline

    20
    ReputationRep:
    (Original post by who cares lmao)
    .im gonna go ahead and say a is increased by 20% because idk it's just me saying random stuff don't dig at me 🤤
    Well why say it at all then lol, that's not helpful to OP.
    Offline

    16
    ReputationRep:
    (Original post by who cares lmao)
    .im gonna go ahead and say a is increased by 20% because idk it's just me saying random stuff don't dig at me 🤤
    Username checks out.
    • Thread Starter
    Offline

    10
    ReputationRep:
    Thanks for all your help guys! Finally got it. It was 49% decrease!
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    Student revising

    Study habits of A* students

    Top tips from students who have already aced their exams

    Study Planner

    Create your own Study Planner

    Never miss a deadline again

    Polling station sign

    Thinking about a maths degree?

    Chat with other maths applicants

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.