Acertain drive-in movie theater has a total of 17 rows of parking spaces. there are 20 parking spaces in the first row and 21 parking spaces in the second row. in each subsequent row there are 2 more parking spaces than in the previous row. what is the total number of parking spaces in the movie theater?

596 parking spaces

Explanation:

The total of parking spaces is the sum of the parking spaces of each row, whit the 20 and 21 from the first and second row you have:

And the information of the other 15 rows must be calculated: the third row has , and the fourth . If we write the number of parking spaces in the fourth row in a way that the number 21 remains, we will have 21+4=25, and the 4 is the 2 added for each row multiplied by two rows so:

Her is the number of parking spaces and the number of row after the second row, in other words, is the third row. THe addition of the numbers of each row is:

Using the formula:

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