Pairs of numbers

Select a pair of cards whose difference is:

1.   68
2.   13
3.   157
4.   65
5.   37

Select a pair of cards whose sum is:

1.   588
2.   431
3.   486
4.   523
5.   418

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Sum of triples

Select 3 cards whose sum is:

1.   109
2.   78
3.   124
4.   103
5.   102

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What is economics

Let's define an economy as a system for the production and distribution of goods and services. From that starting point, write a definition of economics.


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Logic gates and circuits

The data selector circuit below uses a control line (W, X, Y or Z) to select one data input for transmission through to the output. But, this circuit will fail when more than one of the control lines tries to select data at the same time.

Describe how to improve this circuit with a decoder circuit such that only one of the four inputs (A, B, C or D) can be transferred to the output, e.g. selecting one input disables the other inputs.

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Descriptive writing

Describe scenes from a movie that you've watched recently. Use the questions below to help your writing:

1. Was the action or event a surprise?
2. What caused it?
3. Who was involved?
4. When did it occur?
5. What was the outcome?
6. Why did it happen?
7. Will it happen again?

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