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# GCSE maths help. watch

1. 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!!

2. For question 1.

When x ∝ 1/√y this means that

Sub in the values of x and y to find the value of k, then substitute this back into the equation above.
3. 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.

4. 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.
5. (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.
6. Thanks guys!!

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