1. Quick Questions 25% of $500 = Simplify: 3a – 2 (a + 4) 45 + 21 x 36 =
Solve 5m – 3 = 87
Increase 1250mm by 10%
1) $125 2) 3 3) =1031 4) 30 5) 1000mm

2. Reading and Interpreting STEP GRAPHS

3. Step Graphs and Mobile Phones
Step functions show the increase in a quantity of steps. For instance how parking fees are determined at Westfield Kotara.
Step functions look like staircases.

4. Graphing Call Costs
Fred wants to choose between Virgin prepaid $2 SIM only and Telstra $2 SIM only. The $30 prepaid cap plan charges for: 1. Virgin are $0.90 per minute with a $0.40 flagfall. 2. Telstra pre-paid charges are $0.85 per minute with a $0.42 flagfall.
Time (mins) 1 2 3 4 5 6 7 8 9
Virgin
Telstra

5. Create a Step Graph
Using the table from the previous slide, create two step graphs, one for Virgin and one for Telstra.
Exercise 14D page 482