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...types of minus sign are distinguished on many calculators. If you have a calculator handy, look at the key pad to see if you have two keys. They are often labelled and ...Numbers, units and arithmetic: Try some yourself - Activity 14 Contour lines on a map show all the points at a given height above sea level. The lines are drawn for each height at 50-metre intervals, and...

...type and design of such a device, we can suppose that a company manufacturing electric water-boilers would have gone through a process similar to the solution-finding methods described in OpenLearn course T207_1 The engineer as problem-solver: the nature of problems. Recalling from there the diagram of the decision-making route (which is attached below for ease of...

...type of rock found on the surface of Mars, called mudstones, contained levels of nitrogen compounds – nitrates – on a par with concentrations we see on Earth. The other elements that are considered essential for life (carbon, phosphorus, sulfur, oxygen and hydrogen) have also been detected on Mars, so perhaps it was once habitable. But the surface of Mars definitely...

...types of stars. A wide variety of combinations of properties are found, such as small, cool, faint red dwarfs and large, hot, highly luminous supergiants. However, some types are more common than others and not all possible combinations of these properties are found among the stars that have been observed. Figure 12 Sizes of stars compared. The colours are indicative of...

...TYPE OF FAMILY NUMBER OF DEPENDENT CHILDREN TOTAL (%) 1 (%) 2 (%) 3 OR MORE (%) Couple 17 37 25 79 Lone mother 6 7 6 19 Lone father 1 1* – 2 Total 24 45 31 100 * This number indicates lone-father families with two or more children. Footnotes In tables like this, the row totals and the column totals should always add up to the same number. For example, in the table...