Final answer:
The correct variable expression for the number of seats in a stadium minus 15 is option (a) x−15. This represents subtracting 15 from the total number of seats in the stadium. An example of this would be if a stadium has 50 seats, then the expression would evaluate as 50 minus 15, which equals to 35 seats.
Step-by-step explanation:
The question is asking to write a variable expression for the number of seats in a stadium minus 15. The correct expression for representing this scenario would be option (a) x−15. This is because 'x' represents the number of seats, and according to the operation described, you are subtracting 15 from the total number of seats.
Let's go through a few examples to understand how to write expressions. Suppose the total number of seats in the stadium is 50. Following the expression (a) x−15, we substitute 'x' with 50, so the expression would look like 50−15, which equals 35. This means there are 35 seats after subtracting 15 unoccupied or removed seats.
Remember, when writing mathematical expressions, what you want to do to one side of the equation (or expression), you should also do to the other side. For instance, if we have the equation y = x and we subtract 15 from 'x' (the independent variable), we need to ensure that we also subtract 15 from 'y' (the dependent variable) to keep the equation balanced.
In conclusion, the correct option for expressing the number of seats in a stadium minus 15 is (a) x−15.