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

Find the sum of the arithmetic sequence
-8, -5, -2, ..., 7

Insert three geometric means
between 1 and 81.

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 4 cans. How many cans, in total, are in the display?

How many terms of the arithmetic sequence -3, 2, 7, ... must be added together for the sum of the series to be 116?

Find which term 4/15 is in the harmonic sequence 1, 4/5, 2/3, 4/7...

Find the harmonic mean of 5, 10 & 15

Write the first 8 terms of the Fibonacci sequence whose 1st term is 9, and 2nd term is 10.

Find the harmonic mean of 10 and 5.

Find the formula for the geometric sequence 2,1,1/2,1/4

Insert 2 geometric means between 6 and 162

Find the arithmetic mean of 6 and 18

Find the arithmetic mean of 7 & 27

Insert two arithmetic means between 16 & 31

Write the formula for an Arithmetic series.

Write the formula for an arithmetic sequence.