Question

The total monthly charges, $C, for a fixed phone line consists of a fixed amount of $9.81 and a variable amount which depends on the usage. For every minute used, $0.086 is charged.
(i) If the duration of usage is 300 minutes, find the total monthly charges for the fixed phone line.
(ii) If the total monthly charges for the fixed phone line are $20.56, calculate the duration of usage.
(iii) Write down a formula connecting C and n, where n is the number of minutes of usage. Hence, state the two variables which are directly proportional to each other.​

Answer 1

Answer:

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Answer 2

sorry bhaiya

mai meet aap us nhi

kar thi hun

sorry