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
Answer:
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Your welcome
A positive and a negative charge are released from rest in vacuum. They move toward each other. As they do: A positive potential energy becomes more positive.
For better understanding, lets explain the terms
- Electrical potential energy is positive and negative. If positive , it mean that the two charges are of the same type, that is, it is either positive or it is negative when the two charges are of opposite types
- A Positive potential energy means that work is done on a positive test charge so as to move it from one place to another, this result in the potential energy increases and also the electric potential increases
From the above we can therefore say the answer A positive and a negative charge are released from rest in vacuum. They move toward each other. As they do: A positive potential energy becomes more positive.
is correct
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