Determine the values of A & B

2.1) Step 1: Identify John's fixed expenses. Fixed expenses are costs that do not change with the number of cars washed. • Power washer rental: R300 per day • Payment to brother Tommy: R50 per day $Fixed expenses = R300 + R50 = R350$ John's fixed expenses per day are $\boxed{R350}$.

2.2) Step 1: Identify the components of total expenses. Total expenses consist of fixed expenses and variable expenses. • Fixed expenses: R350 (from 2.1) • Variable expenses: R4 per car Let $x$ be the number of cars washed. Step 2: Write the formula for total expenses. $Expenses = Fixed expenses + (Variable cost per car \times Number of cars)$ $E(x) = 350 + 4x$ The formula for expenses is $\boxed{E(x) = 350 + 4x}$.

2.3) Step 1: Determine the value of A. A represents the income for 5 cars. John charges R120 per car. $A = 5 cars \times R120/car = R600$ Step 2: Determine the value of B. B represents the expenses for 15 cars. Use the formula $E(x) = 350 + 4x$ from 2.2. $B = E(15) = 350 + 4(15)$ $B = 350 + 60$ $B = 410$ The values are $\boxed{A = 600}$ and $\boxed{B = 410}$.

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