Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Help with Maths problems please

  • 09-10-2009 12:26am
    #1
    doctor evil
    Closed Accounts Posts: 3,114 ✭✭✭


    Q: Rearrange the equation to make the unknown variable the subject.

    A = 2pie r h + 2 pie r squared. Find h if v=10, u=6, a=4.


    NB How do I get pie, squared, power of on the keyboard?

    Q: Give answers correct to 2 significant figures

    E = mc squared Find E if m=2.0 x 10 to the power of 5 if c= 3.0 x 10to the power of 8

    One final question about the square root.

    Q: x squared + 4 = 0

    I know there is no solution but I don't understand the square root of the +4 is not gotten straight away? Why is the 4 moved to the other side of the equal sign?

    Thanks if anyone has gotten this far!


Comments

  • #2
    henbane
    Registered Users, Registered Users 2 Posts: 1,636 ✭✭✭henbane


    doctor evil wrote: »
    Q: Rearrange the equation to make the unknown variable the subject.

    A = 2pie r h + 2 pie r squared. Find h if v=10, u=6, a=4.
    Have you tried re-arranging the equation? v, u and a don't figure in the equation given, is there more to this question than the part quoted above?
    NB How do I get pie, squared, power of on the keyboard?
    [latex]A=2 \pi r h + 2 \pi r^2[/latex] Links to guides to latex in [thread=2055679780]this thread[/thread]. If you quote this post, you should be able to see how that equation is made.
    Q: Give answers correct to 2 significant figures

    E = mc squared Find E if m=2.0 x 10 to the power of 5 if c= 3.0 x 10to the power of 8
    It's simply multiplication. If the issue is the notation: [latex]2 \times 10^5 = 200000.0[/latex]. How to multiply numbers expressed in scientific notation
    One final question about the square root.

    Q: x squared + 4 = 0

    I know there is no solution but I don't understand the square root of the +4 is not gotten straight away? Why is the 4 moved to the other side of the equal sign?
    There is a solution; I assume you haven't covered complex numbers. What you are suggesting would give [latex]\sqrt{x^2 + 4} = 0[/latex] which is no easier to simplify.


Advertisement