# SS.01.1 – Sequences - PowerPoint PPT Presentation

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SS.01.1 – Sequences. MCR3U - Santowski. Examples of Sequences. ex 1. Write a sequence that represents the following situation: Erin sells vacuum cleaners and earns \$400/month plus \$100/vacuum she sells. (A) Examples of Sequences.

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SS.01.1 – Sequences

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## SS.01.1 – Sequences

MCR3U - Santowski

SS.01.1 - Sequences

### Examples of Sequences

• ex 1. Write a sequence that represents the following situation:

• Erin sells vacuum cleaners and earns \$400/month plus \$100/vacuum she sells.

SS.01.1 - Sequences

### (A) Examples of Sequences

• ex 2. Write a sequence that represents the following situation:

• Nigel deposits \$500 once and earns 5% interest on the principle at the end of each year

SS.01.1 - Sequences

### (A) Examples of Sequences

• ex 3. Write a sequence that represents the following situation:

• Andrew bounces a rubber ball from a height of 2 m and the ball bounces to a height of half the previous bounces’ height.

SS.01.1 - Sequences

### (A) Examples of Sequences

• ex 4. Write a sequence that represents the following situation:

• Sean tosses a coin and records a 1 for heads and a 0 for tails

SS.01.1 - Sequences

### (A) Examples of Sequences

• ex 5. Write a sequence that represents the following situation:

• To make a Sierpinski’s triangle, you take an equilateral triangle, divide it into four congruent triangles by joining the midpoints of the sides of the larger triangle. Then repeat the process with the second pattern in the triangle to make a third pattern and so on.....

SS.01.1 - Sequences

### (B) Definitions & Terms

• A sequence is a set of numbers arranged in order.

• A sequence can be classified as a finite sequence, meaning that it has a certain number of terms or as a infinite sequence, meaning it has an endless number of terms.

SS.01.1 - Sequences

### (B) Definitions & Terms

• Each number in the sequence is called a term. Each term is numbered and presented in the following notation: t1 is designated as the first term; tn is referred to as the nth term.

SS.01.1 - Sequences

### (B) Definitions & Terms

• The terms of a sequence may or may not have a specific pattern. If there is a pattern, then we can come up with a rule or an algebraic expression to describe every term of the sequence. This rule is called the general term of the sequence.

SS.01.1 - Sequences

### (B) Definitions & Terms

• The sequence can be plotted on a Cartesian plane, where the position of each term (the number of each term) is plotted on the x axis and the term value is plotted on the y axis.

SS.01.1 - Sequences

### (B) Definitions & Terms

• Plot looks like this:

SS.01.1 - Sequences

### (C) Examples

• ex 1. Given the sequence 1,5,25,125,625,.... find the next four terms

• ex 2. Given a formula, find the first 5 terms

• (i) tn = 3n - 2

• (ii) tn = n² - 1

• (iii) tn = (n-2)/(n+2)

• (iv) tn = 5n - 1

SS.01.1 - Sequences

### (C) Examples

• ex 3. Find the formula for the nth term (or the general term), then list the next three terms:

• (i) 5,10,15,20 ......

• (ii) 2,3,4,5,......

• (iii) 1,4,9,16,.......

• (iv) 2,4,6,8,.....

• (v) -3,-6,-12,-24....

• (vi) 1/2, 2/3, 3/4, 4/5,.......

SS.01.1 - Sequences

### (D) Homework

• page 21-23, Q1-5eol,7,12,14,17-19

SS.01.1 - Sequences