What is the input to a trigonometric function? A ratio, the x position of a point of the circle, a central angle of a circle or
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Let x be the number of rows.
If the number of rows is 7 less than the number of seats in each row, then the number of seats in a row is x+7. The total number of seats is
x·(x+7).
You know that a theater can seat 120 people, then
x·(x+7)=120.
Solve it:
The number of rows must be positive, then x=8.
Answer: there are 8 rows with 15 seats at each.