Question: daisy has a busy social and work life and uses...
Daisy has a busy social and work life and uses her mobile phone to stay in contact. She is trying to compare mobile phone providers to find the most cost effective option for her.
Phones’R’Us offer a $40 per month plan. This includes 15 000 free SMS within Australia. For each SMS over 15 000, Phones’R’Us then charge a flat rate of 0.1 cents per SMS.
Text’4’Cheap charge 0.35 cents per SMS but have no monthly costs.
a) Equations in the form of can be used to represent these mobile phone plans.
(i) Write an equation to represent the Text’4’Cheap mobile phone plan.
(ii) Write two equations to represent the Phones’R’Us mobile phone plan. Hint, the first equation will be for and the second will be for