Answer:
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Explanation:
The 1st row has 15 chairs.
The 2nd row has 15 + 3 = 18 chairs.
The 3rd row has 18 + 3 = 15 + 2•3 = 21 chairs.
The 4th row has 21 + 3 = 15 + 3•3 = 24 chairs.
The pattern continues, so that the n-th row has 15 + (n - 1)•3 = 3n + 12 chairs.
If there are 15 rows, then the total number of chairs is

where we use the formulas


The type of recommended payment will depend on the type of period and earning amount, thereby more information is required to choose one option.
<h3>Which is the type of payment?</h3>
The type of payment generally makes reference to the period in which a person earns a particular amount of money.
For example, in a salaried payment option, an employee might earn more money per week than an hourly employee.
To determine the recommended payment it is required to obtain more information about monthly/weekly and day earning options.
Learn more about salaried payment options here:
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