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...children’s birthday party and splitting the bill in a restaurant. Addition (+) is used when you want to find the total, or sum, of two or more amounts. Subtraction (−) is used when you want to find the difference between two amounts or how much of something you have left after a quantity is used. For example, if you want to find out how much change you are owed after...

...children 4.833 3333 biscuits each. Similarly, an answer which suggests you can afford to take 10.134 people on an outing is not very sensible. When you get a mathematical answer, you need to interpret the answer within the context of the original problem and round your answer appropriately for the situation. So if you could afford to take 10.134 people on the trip, you...

...research is needed to understand the relative COVID-19 risk of patients exposed to different immunotherapies. Stem cell transplant and COVID-19 Blood forming cells in the bone marrow can become depleted by radiotherapy or chemotherapy. Stem cell transplants are used to restore blood-forming stem cells. After a stem cell transplant, patients are more at risk of becoming...

...centre of one atom to the centre of another. Figure 4 illustrates this for a simple plane of identical atoms – fully three-dimensional networks are more realistic but less easy to draw. [Figure 4] Figure 4 Atoms in a solid can be represented as spheres, arranged in planes as a component of some three-dimensional configuration What happens if we try to force the atoms...