Which of the following represents the sum of the sequence

6, 12, 20, 30 ?

Which choice represents 3 + 6 + 9 + 12 + ...

for 28 terms ?

Which choice represents:

Evaluate:

What is the common difference in the arithmetic sequence: -4x, -x, 2x, 5x, 8x, ... ?

Given the sequence: m, (m + n), (m + 2n), (m + 3n), ...

Which expression can be used to determine the common difference of this sequence?

An arithmetic sequence has a first term of 8 and a sixth term of 38. What is the 50^th term of this sequence?

Which sequence has a common difference of 5?

Which function defines the sequence

-6, -10, -14, -18, ..., where f (1) = -6 ?

Find a₆ for an arithmetic sequence where

a₁ = 3x + 1 and d = 2x + 6

When asked to insert 3 arithmetic means between -3 and 17, what is the common difference?

A theater has 42 seats in the first row. Each row has 5 more seats than the row before it. Which expression represents the number of seats in the n^th row?

Find the sum of the first 20 terms of the arithmetic sequence: 4, 6, 8, 10, ...

Find the sum of an arithmetic sequence whose last term is

a₁₀ = -26 and whose common difference is d = -4.

Evaluate this series using a formula:

Find the sum of the positive integers from 4 to 44 inclusive.

A display of cans on a grocery shelf consists of 20 cans on the bottom, 18 cans in the next row, and so on in an arithmetic sequence, until the top row has only 4 cans. How many cans, in total, are in the display?

The sum of the first three terms of an arithmetic sequence is 108, and the sum of the next three terms is 183. What is the value of the 11^th term?

Given: a₁ = 3; a_n = a_n-1 - 4

Find the sum of the first 315 terms of this sequence.