Find the sum of the first 10 terms of the arithmetic sequence 15, -7, 1, 9, ...

The first row of a lecture hall has 20 seats and each row after the first has two more seats than the row before it. There are 30 rows of seats. Find the total number of seats in the lecture hall.

TRUE OR FALSE: The sequence 1, 4, 8, 13, 19, 26, ... is an arithmetic sequence.

Classify this sequence as arithmetic or not. If the sequence is arithmetic, find the common difference d. -5/3, -1, -1/3, 1/3, ...

How many terms are there in the given arithmetic sequence: -5, -1, 3, ..., 75

TRUE or FALSE: If the first term of an arithmetic sequence is 5 and the third term is -3, then the fourth term is -7.

Find the general term of the arithmetic sequence given a_1=5, d=-3

Find the sum of the first 15 terms of the arithmetic sequence -12, -3, 6, 15, ...

Find the general term of the arithmetic sequence 4, 14, 24, ...

A sequence is formed by writing the integers the corresponding number of times as follows: 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, .... What is the 800th term in this sequence?

Seven consecutive integers are listed. The sum of the smallest three is 33. What is the sum of the largest three?

Classify this sequence as arithmetic or not. If the sequence is arithmetic, find the common difference d. -6, -10, -14, -18, ...