Atheater has 25 rows of chairs. the first row has 18 chairs, the second has 22, and the third has 26, and so on. in total, the theater seats people.

In total, the theater seats 1650 people.

Step-by-step explanation:

Given : The number of rows in the theater = 25

The number of chairs in first row = 18

The number of rows in the second row = 22

The number of rows in the third row = 26

The common difference in the number of chairs for the consecutive rows =

Thus its a Arithmetic progression.

Let n be the number of rows and d be the common difference , then the total number of chairs in n rows is given by :-

, where a is the umber of chairs in first row .

Put a = 18, d=4 and n = 25, we get

Hence, In total, the theater seats 1650 people.

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

step-by-step explanation: