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...simple expression, it is useful to see how you might use other calculator functions when you are faced with more complicated expressions to evaluate. The expression for the volume of wood requires the value of . You could enter an approximate value for by hand, but this is time-consuming and may be prone to error. The calculator has an approximation for built into it,...

...simple answer is ‘any number that does not include a fraction or decimal part’. So for example, 3 is a whole number, but 3 one divided by two or 3.25 are NOT whole numbers. Numbers can be positive or negative. Positive numbers can be written with or without a plus (+) sign, so 3 and +3 are the same. Negative numbers always have a minus (–) sign in front of them,...

...simple physics and analyse such a situation you discover it’s not easy at all. No matter how sophisticated you are. And to give you a feel for that, let’s just imagine that we had rocket propulsion engines which can get us up to say the tenth of speed of light, which by the way is about as fast as you can go without being in great danger of being destroyed because at...

...simple algebra to solving scientific problems. This OpenLearn course is an adapted extract from the Open University course S282 Astronomy...Introduction to active galaxies: Learning outcomes - After studying this course, you should be able to: explain how and why the optical spectrum of an active or starburst galaxy differs from that of a normal galaxy explain how and why...

...coded to show hardness of water.] Figure 1 Hardness of water across the UK An easy way of telling if you have hard water is to think about what happens when you use soap. It is very difficult to form a good lather with soap used in hard water areas. In reality, water hardness is not actually a problem. A modern brewery often wants to be able to make all different types of...