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To calculate the probability assume it is equally likely to choose any of the 10 balls. This is reasonable as we are told that the balls are the same apart from their colours. If we label each ball by num...

One can treat complex multiplication as polynomial multiplication, but remembering i^2 = -1. To perform polynomial multiplication, multiply each term one by one, then add them together. Hence (3+i)(1+2i) ...

First to note is how average speed, v, distance, d, and time, t, are related. This is given by v = d/t. The journey is split into two parts, but we are only asked for the total distance and average speed....

I have volunteered for charity XYZ which involved communicating with various different sorts of people. I have also volunteered in a nursery and worked with younger children which has allowed me to adapt ...

1. Break down involves a single reaction (speed)
2. Energy is released in small, manageable amounts.
3. Soluble