The sum of the first five terms of an arithmetic sequence is $150$ and the sum of the first ten terms is $550$.

What are the first three terms of the sequence?

Find the sum of the first $25$ terms of the arithmetic sequence below.

$11, 22, 33,\dots .$

Find the sum of the first $25$ terms of the arithmetic sequence below.

$12, 23, 34,\dots$

Find the sum of the first $25$ terms of the arithmetic sequence below.

$21, 32, 43,\dots .$

Find the sum of the first $25$ terms of the arithmetic sequence below.

$19, 28, 37,\dots$

Find the sum of the first $25$ terms of the arithmetic sequence below.

$1, 6, 11,\dots .$

What is the difference between the sum of the first $20$ terms and the next $20$ terms of the arithmetic sequence $6, 10, 14,\dots$?

Calculate the difference between the sums of the first $20$ terms of the arithmetic sequence $6, 10, 14,\dots$ and $15, 19, 23, ....$