GCSE maths help. Watch

Uel369
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#1
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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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MikeL230
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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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Straightpath
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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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MikeL230
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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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mrmanps
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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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Uel369
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Thanks guys!!
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