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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 first vehicle to arrive at the intersection has the right-of-way in such cases.
- Following the officer's instruction is the best as it overrides traffic signals and signs.
<h3>What is a Traffic signal?</h3>
These are devices which are installed on roads to direct the flow of traffic in the area.
In cases where an officer is directing traffic, his instruction must be followed in such situations
Read more about Traffic signal here brainly.com/question/2353673
A wrecker is considered to be an emergency vehicle when it's emergency lights are flashing. Under normal circumstances, a wrecker's lights are not flashing when it is just a truck or a service vehicle.
