4.3 Work out the perimeter of shape number: 4.3.1 10


4.3.2 150


4.4 Draw a flow diagram that shows how to work out the number of rectangles (r) in shape n.


4.5 Draw a flow diagram that shows how to work out the number of rectangles (r) if the input value is the perimeter (p) of the shape.


4.6 How many rectangles are there in a shape with a perimeter of: 4.6.1 402 cm?


4.6.2 1 914 cm?


5 Lungi’s father offered him R20 per day for 25 days to help with the harvest, but Lungi asked for 1c on the first day, 2c on the second day, 4c on the third day, 8c on the fourth day, and so on. His father agreed and thought that this was a bargain.


5.1 How much would Lungi have received if he accepted his father’s offer? 5.2 Copy and complete the table below to show Lungi’s wage (payment) for the first eight days:


Day Lungi’s wage 1 1c 2 2c 3 4c 4 8c 5 16c 6 ...c 7 ...c 8 ...c


5.3 Work out a formula to calculate Lungi’s wage (w) in cents on day n. 5.4 Copy the following table and use your formula to complete it:


Day Lungi’s wage 5 16c 10 ...c 15 ...c 20 ...c 25 ...c


5.5 What was Lungi’s wage on day 25 in rands and cents? 5.6 Work out the difference between Lungi’s wage on day 25 and the total wages that his father originally offered him.


Unit 3: Input and output values


131


CHAPTER 4


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