BIDMAS and Formula

Question 1

4³ =

Answer 1

4 x 4 x 4 = 64

Question 2

6 - 3² x 2

Answer 2

(BIDMAS do Indices first, then x, then -)
6 - 9 x 2 =
6 – 18 = -12

Question 3

Using the formula below, calculate the monthly cost of a mobile phone if you made 1.5 hours of calls.
C = 20 + 0.30t,
where C is the cost in £
and t is the time in minutes

Answer 3

(1.5 hours = 90 minutes)

20 + 0.30 x 90 = £47