Search over 10,000 free study notes

First calculate the total number of pens in the bag by adding together the amounts of each different colour.7+4+6=17Since there are 7 blue pens to chose from out of a possible 17, the probability of choos...

3 Stacks of coins - A B CAltogether the stacks add up to 130 pence (let's work in pence so its not too confusing). So, A+B+C=130pStack B has 3 times as much money has Stack A. So B = 3A...

A set of simultaneous equations most commonly represents two lines on a graph, or perhaps a circle, with a line running through it. When you solve a set of simultaneous equations, its important to remembe...

Smoking among younger people

This answer is best supported with a whiteboardAll living things need nitrogen, but nitrogen gas is too unreactive for plants and animals to use directly. Bacteria's main role in the nitrogen cyc...