To determine this, you first need to determine the gradient of the straight line inFigure 11.

The new vertical scale goes from 0 to 180 as the Celsius scale on the horizontal axis goes from 0 to 100. So the gradient is

and the relationship be
Author(s): The Open University

Look at Figure 9. Start with the map distance on the horizontal scale, move vertically up until you reach the line, then move horizontally until you reach the vertical axis. The number at that point will give you the corresponding ground distance in kilometres.

Author(s): The Open University

This means, for instance, that if you double one value, the effect is to double the other, and if you third one value, the upshot is that the other is divided by three as well. And the fact that the relationship is directly proportional has an important consequence for the graph-it will necessarily be a straight line.

Only two points are needed to draw a straight-line graph. Choosing one of the points is straightforward, it is the origin of the graph. Why? Because zero distance on the m
Author(s): The Open University

Grateful acknowledgement is made to the following sources for permission to reproduce material in this unit:

The content is taken from an activity written by Marion Hall for students taking courses in Health and Social Care, in particular those studying K101 An Introduction to Health and Social Care. The original activity is one of a set of skills activities made available to all HSC students via the HSC Resource Bank.

Except for third party materials and otherwise stated (see
Author(s): The Open University

## Example 4

Author(s): The Open University

In Example 1 it is the use of many numbers that identifies it as mathematics and suggest the area of mathematics called arithmetic. Example 2 has numbers but also graphs and diagrams, suggesting statistics. The shapes in Example 3 suggest that the geometrical part of mathematics is being used whereas Example 4, with all the alphabetic symbols, is clearly drawing upon algebra.

In the next activity you will be asked to look in more d
Author(s): The Open University

## Example 1

Author(s): The Open University

In this section we have introduced you to the PROMPT checklist as a useful tool for assessing the quality of any piece of information. If you use it regularly you will find that you develop the ability to scan information quickly and identify strengths and weaknesses. As a closing exercise you might like to pick one of the websites below or any of your own choice and try to evaluate it using the PROMPT criteria. To make it easier for you we have provided a printable checklist (see below).
Author(s): The Open University

This unit focuses on the problem of greenhouse gas emissions, especially carbon dioxide, and explore what you can do to lighten those emissions to help reduce the rate of climate change. You will assess your â€˜carbon footprintâ€™ and see what actions you and, if relevant, other household members could take to lighten that footprint. You will also better understand which actions are more and less effective, and the scope and limits of what individuals can do at the personal and household leve
Author(s): The Open University

Several pieces of legislation make the preparation of emergency plans a statutory requirement. The European Directive on the control of major accident hazards (Council of the European Union, 1996a), the â€˜Seveso II Directiveâ€™, outlines the planning requirements for industrial sites with large inventories of hazardous substances. In the UK, the requirements of this directive have been incorporated into the Control of Major Accident Hazards Regulations (Health and Safety Executive, 1999a). I
Author(s): The Open University

Captain James Lovell chose the title â€˜A successful failureâ€™ for an article on the Apollo 13 Lunar Mission. The failure was that the lunar landing was abandoned. The success was that, although an explosion blew a gaping hole in the spacecraft three-quarters of the way to the moon and knocked out the electrical systems as well as the service module's engine, the three astronauts returned safely to Earth. Can you think of a better example of the value of emergency planning?

Two feature
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An alternative technique to that of sedimentation is flotation. This uses gas bubbles to increase the buoyancy of suspended solids. The gas bubbles attach to the particles and make their effective density lower than that of the water. This causes the particles to rise through the water to float to the top. Flotation may be achieved by several methods but the most effective form is dissolved air flotation. In this process (Figure 27) air is dissolved in water at elevated pressures and then rel
Author(s): The Open University

Environmental radiation comes from a range of naturally occurring and anthropogenic sources, with the former estimated to contribute more than 98% of the radiation dose experienced by people (excluding medical exposure). Any exposure to radiation can lead to cancer, and the greater the exposure, the greater the risk.

The contribution that drinking water makes to radiation intake is very small, and is due largely to naturally occurring radionuclides (isotopes of an element which are unst
Author(s): The Open University

Groundwater is water that, after infiltrating and percolating through surface soils, flows into an aquifer, an underground water-bearing layer of porous rock. About one-third of the UK's drinking water is drawn from aquifers.

To permit economic development, an aquifer must be able to transmit large quantities of water from one point to another and therefore it must have a high permeability. The groundwater contained in aquifers is released from springs an
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In considering the value of religions, we can begin by saying that one of the first tasks of the critical student should certainly be to test the basis of judgements offered by other commentators. We saw earlier that the Church of Scientology has had problems gaining official recognition as a â€˜religionâ€™ in
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I noted earlier that differences between the truth claims made by religions has led those who practise Religious Studies to avoid premature judgements when dealing with questions relating to the truth and value of particular religions. By seeming to by-pass truth claims, you may feel that what I have been describing as Religious Studies avoids what many would regard as the purpose of religion â€“ to deal in truths. This is a difficult area to cover briefly, but let me at least try to explain
Author(s): The Open University

Hitler's government was sworn in on 30 January 1933. On 28 March all Nazi Party organisations were urged to carry out a boycott of Jewish businesses and professionals on 1 April. The exhortation came from â€˜the Party Leadershipâ€™ and claimed that the boycott was in response to the lies spread in the foreign press by Jewish emigrants; in reality, though, it was an attempt to impose some discipline on the freelance, anti-Semitic vandalism and violence of Nazi activists (especially the SA) in
Author(s): The Open University

For a literate civilisation extending over some 4000 years, that of the ancient Egyptians has left disappointingly little evidence of its mathematical attainments. Even though the classical Greeks believed mathematics to have been invented in Egypt â€“ though their accounts are far from unanimous on how this happened â€“ there are now but a handful of papyri and other objects to convey a sense of Egyptian mathematical activity. The largest and best preserved of these is the Rhind papyrus (Ext
Author(s): The Open University

When the National Trust took over the Aberdulais Falls and the associated buildings, the site was derelict, overgrown and dangerous. Prior to the Trust's ownership, public access to the Falls over the land surrounding it had been denied. Important decisions had to be taken regarding the future of the site.

The A465 slices through the site and the suburbs of Neath have encroached on the river bed on both sides.

Author(s): The Open University

This unit presents information about how Scottish healthcare institutions were influenced by the underlying social, economic, political and cultural contexts.

In the seventeenth and eighteenth centuries, a series of innovative models of the body was produced, from the mechanical to the mathematical to the sensible. As groundbreaking anatomical investigation and physiological experimentation were carried out, the map of the body changed, and different parts (vessels, glands, nerves) acqu
Author(s): The Open University