18 – 5 x 2 + 3 = ?

15 x 2 – (8 + 4) = ?

(14 – 6) x (6 + 2) = ?

3 + (4² - 2³) = ?

Calculate the value 6(a + b) when a = 5, b = 3 and c = 9

Calculate the value 5a + 3b – c, when a = 5, b = 3 and c = 9

16 + 8 × 7 ÷ 4 = ?

8 x 5 – (5² - 9) = ?

Anna uses her mobile phone on the trip. The mobile phone company uses the formula C = 15 + 0.12m to calculate the total cost, C pounds, for a customer who makes m minutes of phone calls in a month. Work out the total cost if Anna makes 200 minutes of phone calls.