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             1) X2 +2Y2= 18 2) X - Y = 3   Rearrange 2) in the form X=3-Y then substitute in to 1); (3-y)2 +2Y2=18, this is your new equation 3 9+3Y+3Y+Y2+2Y2=18 3) 9+6y+3Y2= 18 Divide equation 3) by 3 3 ...

First, you need to find value of one part. We can see that Wim who has a share of 5 parts gets £115. So, 5 parts is equivalent to £115. Therefore, value of each part is 115/5 = £23. Now,...

c = 4-d/d+3 x d+3 = c(d+3)= 4-d = cd +3c= 4- d = cd+d=4-3c. = d(c+1)=4-3c = d= 4-3c/c+1

We need to consider two possibilities, you could either pick out two blues or two reds. To find the total probability we work it out for each individually and then add them together. We can find the proba...

£1200 is 80% of the original price.We need to find what 100% of the original price is.if £1200 is 80% then to find 1% we can divide it by 80.
1200/80=15
£15 is 1% of the original price to find 1...