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!!

0
8 years ago
#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.
0
8 years ago
#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.

0
8 years ago
#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.
0
8 years ago
#5
(Original post by Uel369)
Can someone give me the compound interest equation, thanks!!
Heres one;
Mr Manps invests Â£5000 in a savings account paying 4.5% per annum. Calculate his total interest after 3 years.
0
#6
Thanks guys!!
0
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