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    Ok. Basically my friend asked me to help her with her maths tonight but there are few things I couldn't remember how do to... its is like 2 years since I did my GCSE... so thought of coming here, obv. lol!!

    1. You're given the following :

    x 1/√y

    when x is 3.6 and y is 1.44, what is the equation connecting x and y??
    (3marks)


    2. You are given the following:

    PQ/R

    P is 50 (1 Significant Figure)
    Q is 1000 (2 sf.)
    R is 0.04477 (4 sf.)

    What is the minimum possible value??


    Can someone give me the compound interest equation, thanks!!

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    For question 1.

    When x ∝ 1/√y this means that  x = \frac{k}{\sqrt{y}}

    Sub in the values of x and y to find the value of k, then substitute this back into the equation above.
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    For question 2, for the minimum value, P and Q have to be as small as possible while R has to be as big as possible

    50 becomes 45

    1000 becomes 950

    0.04477 becomes 0.044775.

    Put these into PQ / R and you get your answer..
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    For question 2. The minimum possible value is when the top of the fraction is as small as possible and the bottom is as large as possible.
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    (Original post by Uel369)
    Can someone give me the compound interest equation, thanks!!
    Heres one;
    Mr Manps invests £5000 in a savings account paying 4.5% per annum. Calculate his total interest after 3 years.
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    Thanks guys!!
 
 
 
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