This graph shows the cost of petrol. It shows that 20 litres will cost £23 or £15 will buy 13 litres. Gradient = \(\frac{\text{change up}}{\text{change right}}\) or \(\frac{\text{change in y}}{\ ...

Things are likely to worsen in the coming decades, but scientists argue urgent action can still limit the worst effects of climate change ... there has been progress in some areas, such as ...