This free course provided an introduction to studying Computing & IT. It took you through a series of exercises designed to develop your approach to study and learning at a distance, and helped to improve your confidence as an independent learner.

Author(s): The Open University

The Slaves That Built the White House
(08:24)
Author(s): No creator set

At the time of writing (2006), the Golden Rice tale is an unfinished story. Some of the developments of the last five years are summarised here.

One area of ongoing scientific dispute is the question of whether the enriched rice can contribute significantly to the alleviation of vitamin A deficiency. We have seen that Shiva estimated that at best 100 g of rice a day would provide 4.4% of the recommended daily allowance. More sophisticated theoretical models, published since that time, h
Author(s): The Open University

The sum of the angles of any triangle is 180°. This property can be demonstrated in several ways. One way is to draw a triangle on a piece of paper, mark each angle with a different symbol, and then cut out the angles and arrange them side by side, touching one another as illustrated.

Author(s): The Open University

A quadrilateral is a shape with four straight sides.
Author(s): The Open University

## Question 1

Find all the remaining angles in each of the diagrams below.

Author(s): The Open University

In Section 1 we formally define real functions and describe how they may arise when we try to solve equations. We remind you of some basic real functions and their graphs, and describe how some of the properties of these functions are featured in their graphs.

Click the link below to open Section 1 (12 pages, 1.8MB).

Section 1
Author(s): The Open University

After studying this course, you should be able to:

• understand the definition of a real function

• use the notation for intervals of the real line

• recognise and use the graphs of the basic functions described in the audio section

• understand the effect on a graph of translations, scalings, rotations and reflections

• understand how the shape of a graph of a function features properties of the function such as increasing, decr
Author(s): The Open University

Except for third party materials and otherwise stated (see terms and conditions), this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Course image:
Author(s): The Open University

## Activity 24

A new train operator boasts ‘Train times reduced by 12%’. Decrease 90 minutes by 12%. Give your answer as minutes and seconds.

In a recipe the quantity of each ingredient needed depends upon the number of portions. As the number of portions increases, the quantity required increases. The quantity per portion is the same. This is called direct proportion. The quantity is said to be directly proportional to the number of portions. If 2 potatoes are required for one portion, 4 will be required for two portions etc. A useful method for direct proportion problems is to find the quantity for one and multiply by the
Author(s): The Open University

Although ratios are often given as fractions, they can also be expressed as decimals. You need to deal with a mixture of fractions and decimals, and to compare ratios given in either form, so you need to be able to convert between the two forms.

## Example 4

The ratio of the circ
Author(s): The Open University

Environment: LA River
Who killed the river that runs through Los Angeles? Did you even know there was a river? Using a mix of archive and new footage , this album tells the fascinating story of a city that has ignored the benefits of its river for decades. Now waking up to the fact that it could be a green belt with more acreage than all of Central Park, river activists are fighting developers to bring back nature to central Los Angeles. Up till now the city conquered the threat of floods by concreting over the river
Author(s): The OpenLearn team

Biofuels
This free course, Biofuels, investigates what is meant by a biofuel and covers the advantages of using biofuels compared with fossil fuels. The different types of biofuel are explored, with particular emphasis on transport biofuels. Finally, the issue of whether biofuels are the complete answer to our future energy needs is considered. First published on Mon, 21 Mar 2016 as
Author(s): Creator not set

The oceans
The oceans cover more than 70 per cent of our planet. In this free course, The oceans, you will learn about the depths of the oceans and the properties of the water that fills them, what drives the ocean circulation and how the oceans influence our climate. First published on Wed, 26 Jun 2019 as Author(s): Creator not set

Waste management and environmentalism in China
This free course, Waste management and environmentalism in China, is an introduction to waste generation and waste management processes currently being practiced in China. This course explores how the Chinese can deal with increasing volumes of waste, drawing parallels with the UK experience of waste management. It also discusses the conceptual tools that can be used to make the cycle of material use, waste production and treatment more sustainable. The course ends with a brief examination of th
Author(s): Creator not set

Aquatic mammals
Mammals come in a bewildering variety of shapes and sizes and yet all of the 4700 or so species have some characteristics in common, which justifies the inclusion of diverse types within a single group. Although mammals evolved on land, a number of species have become adapted to spending part or all of their lives in water and it is these mammals that you are going to concentrate on in this course. You will meet some aquatic mammals, find out how we can study them, consider their evolutionary hi
Author(s): Creator not set

Studying mammals: The insect hunters
From pygmy shrews to armadillos, a wide range of mammals survive on a diet made up largely of insects. Many of these have fascinating adaptations suited to catching or rooting out their prey. In this free course, Studying mammals: The insect hunters, you will learn about these adaptations, along with survival strategies for when food is scarce. This is the second course in the Studying mammals series. Author(s): Creator not set

The fact that the Earth really is warming up now commands near-universal support. However, it is one thing to detect a global warming trend that appears to be unprecedented in the past millennium (Subsection 2.2.2), and quite another to establish with a given level of confidence that it has been caused by (i.e. can be attributed to) human activity - specifically, the increase in greenhouse gas concentrations and associated radiative forcing since pre-industrial times (reviewed in Secti
Author(s): The Open University

Throughout this course, a major concern has been to show how the demand of the antisweatshop movement that we not only respond to, but take responsibility for, economic injustices, no matter how distant, is an intensely controversial one. Claims by campaigning groups such as Oxfam and Christian Aid that consumer demand for cheap branded goods perpetuates poverty wage levels in the sweatshop industries are countered by claims from the pro-market lobby which point in an altogether differ
Author(s): The Open University