The total cost of a taxi ride is calculated by adding a fixed charge of £4 and a charge of £2 per mile. Write a formula to work out the total cost, £C, of a journey of m miles.

The problem describes how to calculate the total cost, C. We need to translate this description into a mathematical formula. The cost has two components: 1. A fixed charge of £4. This amount is paid regardless of the distance. 2. A charge of £2 per mile. This amount depends on the number of miles, m. For m miles, this charge is 2 × m, or 2m. The total cost, C, is the sum of these two components. Total Cost = Fixed Charge + (Charge per mile × Number of miles) C = 4 + 2m