Search over 10,000 free study notes

Total number of balls = 4 + 2 + 5 = 11 (this is our denominator for first draw)Numerator is the number of each colour. When we remove a ball the denominator and numerator for that colour decrease by 1. P(...

Firstly, start off by expanding the brackets on the left hand side of the equation

a(4x+12) would expand as below:
4x multiplied by a gives 4ax12 multiplied by a gives 12a

We no...

Make x the subject of either equation:x = (32-2y)/2;x = 16-yRepresent an equation as a function of y only: 7(16-y)+3y = 84;112-7y+3y = 84;112-4y = 84;-4y = -28; y = 7Use the value of y to determine value ...

First take out a factor of x to give x(14xy - 28y²)Next take out a factor of y to give xy(14x - 28y)Finally take out a factor of 7 to give 7xy(2x - 4y)

Step 1. Take one equation and make either x or y the subject of the formulax=9+3y, 5x+y=21Step 2. Substitute in the equation5(9+3y)+y=21Step 3. Make y the subject of the formula45+15y+y=21 (multiplied out...