What is the difference between an arithmetic sequence and a geometric sequence? how can each type of sequence be in everyday situations? provide an example and the corresponding equation for each type.

Answers

Part 1

Arithmetic sequence is a sequence by which the next term is found by adding a constant number. It can be a positive number or a negative number. This number is called the common difference. On the other hand, a geometric sequence is one whose next term is found by multiplying the previous term with a constant (common ratio).

Part 2

Sequences are useful in our daily lives as well as in higher mathematics. For example, the interest portion of monthly payments made to pay off an automobile or home loan, and  the list of maximum daily temperatures in one area for a month are sequences.

Example: arithmetic sequence

A child building a tower with blocks uses 15 for the bottom row. Each row has  2 fewer blocks than the previous row. Suppose that there are 8 rows in the tower. Find an for n = 8.

The number of blocks in each row forms an arithmetic sequence with a₁ = 15 and d= −2. The formula to be used is  an = a₁ + (n − 1)d.

Example: geometric sequence

An insect population is growing in such a way that each new generation is 1.5  times as large as the previous generation. Suppose there are 100 insects in the first  generation.  How many will there be in the fifth generation?

The population can be written as a geometric sequence with a₁ as the first generation  population, a₂ as the second-generation population, and so on. Then the fifth generation  population will be a₅. The formula to be used is an = a₁×r⁽ⁿ⁻¹⁾

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