Math Studies 2 - Maryvale High School · 8. 6th term: 96, 48, 24, 12, 6 ...
Transcript of Math Studies 2 - Maryvale High School · 8. 6th term: 96, 48, 24, 12, 6 ...
Week 7, Lesson 1Essential Question Essential Question Essential Question Essential Question Essential Question Essential Question Essential Question
Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup
531. Warmup2. Arithmetic Sequences3. ICA Which one4. Independent Work
Warmup: Find the domain and range of the function
Arithmetic Sequences
How do we determine whether a sequence is arithmetic?
How do we determine whether a sequence is arithmetic?
Domain:
Range:
Arithmetic SequencesNotes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes
Arithmetic Sequence
i.e.: an = 4, 13, 22, 31, 40, 49, ...
i.e.: an = 15, 11, 7, 3, 1, 5...+9 +9 +9 +9 +9
+4 +4 +4 +4 +4
Common Difference The number that is being added to find the next term
nth term of an Arithmetic Sequence:
Standard 1.7
A pattern of numbers where you ADD the same number every time
1st term common difference
term you are looking for
Arithmetic SequencesNotes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes
Summary:
Example 1 Given the arithmetic sequence, find the common difference, the nth term, 7th term, and 120th term of the sequence
an = 52 , 45 , 38 , 31 , ...
d: nth:
7th: 120th:
Example 3 Given the following information, find the formula for the nth term of the arithmetic sequence
8th term: 73 13th term: 48
Example 2 If the 2nd and 3rd term of an arithmetic sequence are 1124 and 2157, then what is the common difference?
Using that information, what is the 1st term of the arithmetic sequence?
Standard 1.7
a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a1373 48 73
48
255
535863687883889398103108
an= 108 + (5)(n1)
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Which One?
Which sequence has a 14th term of 207?
Which sequence has a 9th term of 55?
Which sequence has a 10th term of 175?
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Homework
Find the domain and range1.
2.
3.
Find the formula for the nth term of the arithmetic sequence4.
5.
6.
Week 7, Lesson 2Essential Question Essential Question Essential Question Essential Question Essential Question Essential Question Essential Question
Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup
How are arithmetic functions related to linear functions?
551. Warmup2. Arithmetic Seq. & Linear Functions3. ICA
Warmup: Find the domain and range of the following function
How are arithmetic functions related to linear functions?Arithmetic Seq. & Linear Functions
Arithmetic Sequences and Linear FunctionsNotes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes
Arithmetic sequences can be closely compared to a linear function.
Standard 1.7
Arithmetic Sequences and Linear FunctionsNotes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes
Summary:
Example 1 For the following arithmetic sequence, find the formula for an, then find a8, a12, and a150.
an = a8 =
a12 = a150 =
Example 2 Two Men and a Truck moving company charges a onetime fee of $110, then $65 per hour. Write a function for their cost
What is the cost of a 7 hour job?
What is the cost of a 12 hour job?
Standard 1.7
Example 3 At Massage Envy, a 1 hour massage costs $35. A 2 hour massage costs $70. At Cindy's Massage, a 1 hour massage costs $60, while a 2 hour massage costs $85.
Write a function for Massage Envy using M(t)
Write a function for Cindy's Massage using C(t)
At how many hours will Cindy's Massage be cheaper?
Example 4 Find the formulas for an and bn for the two arithmetic sequences below.
an = bn =
Find :a4 = b4 =
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M(t)= 35+35(n1)
C(t)= 60+25(n1)
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Find the domain and range of the following
1.
2.
3.
Find the formula for the nth term of the arithmetic sequence4.
5.
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Essential Question Essential Question Essential Question Essential Question Essential Question Essential Question Essential Question
57Week 7, Lesson 3
How do we determine if a sequence is Geometric?
Warmup: Find the domain and range of the following function
1. Warmup2. Geometric Sequences3. ICA4. Independent Work
How do we determine if a sequence is Geometric?Geometric Sequences
Domain:
Range:
x x 4
y y 3
Geometric SequencesNotes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes
Geometric Sequences A pattern of numbers where we MULTIPLY the same number to find the next term
i.e. 2 , 4 , 8 , 16 , ...
i.e. 3 , 12 , 48 , 192 , ...
Common Ratio The number that is being multiplied to find the next term
nth term of a Geometric Sequence:
Standard 1.8
1st term
common ratio
term you are looking for
Geometric SequencesNotes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes
Summary:
Example 1 Given the geometric sequence, find the common ratio, an, a5, and a12 term of the sequence
an = 3, 15, 75, 375, ...
r: an =
a5 = a12 =
Example 2 Consider the geometric sequence
4.5 , 9 , a , 36 , b , ...
r: an =
a = b =
Example 3 In a geometric sequence, a3 = 8 and a6 = 64.
Find the common ratio and a10
r = a10 =
Standard 1.8
x5 x5x5
x5
a5= 1,875 a12= 146,484,375
x2
x2
18 72
a1 a2 a3 a4 a5 a68 6416 3242
x2 x2 x2
x2 1024
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Let's compare the geometric sequence to the arithmetic sequence below. When will each
sequence have a value of 384?
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Find the given term in each sequence. Use the answers to solve the riddle.1. 12th term: 3, 6, 12, 24, 48 ... T2. 8th term: 1, 4, 16, 64, 256 ... S3. 9th term: ‐4, ‐2, 0, 2, 4 ... F4. 6th term: 1/2, 1, 2, 4 ... E5. 7th term: 3, 6, 12, 24 ... L6. 5th term: 1, 1.5, 2.25, 3.375 ... C7. 10th term: 1/3, ‐1/3, 1/3, ‐1/3, 1/3... K8. 6th term: 96, 48, 24, 12, 6 ... A9. 10th term: 5, ‐5, 5, ‐5, 5 ... R10. 6th term: 1, 2, 4, 8 ... M
Week 7, Lesson 41. Warmup2. Decreasing Geometric Sequences
3. ICA
Essential Question Essential Question Essential Question Essential Question Essential Question Essential Question Essential Question
Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup Warmup
59Warmup: A teenager puts $10.00 into his savings account. One week later, he puts $10.25 in the bank. Two weeks later, he puts $10.50 in the bank and so on. How much money does he put in the bank on the 25th week.
How does a geometric sequence change when it is decreasing?
How does a geometric sequence change when it is decreasing?Decreasing Geometric Sequences
10 10.25 10.50
10+0.25(n-1)10+0.25(25-1)
He will deposit $16 to the bank on the 25th week.
Warmup: A teenager puts $5.00 into his savings account. One week later, he puts $5.50 in the bank. Two weeks later, he puts $6.00 in the bank and so on. How much money does he put in the bank on the 22nd week.
Decreasing Geometric SequencesNotes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes
Summary:
Look at the sequence below. Try and find the explicit formula for the geometric sequence
120 , 80 , 53.3 , 35.5 , 23.7 , ...
If a geometric sequence is decreasing, then the common ratio is between 1 and 1
i.e. 8 , 4 , 2 , 1 , ...
Example 1 Find the explicit formula for a geometric sequence given the following information
a5 = 125 a8 = 1
Standard 1.8
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4, 2, 1, 0.5, 0.25, ...
Find the values of a1 and r.
108, 36, 12, 4, 4/3 ...
Find the next three terms of each sequence.
3, 6, 12, 24, . . . 225, 45, 9, 1.8, . . .
80, 20, 5, 1.25, . . . 3, 12, 48, 192, . . .
Determine whether each sequence is arithmetic or geometric.
2, 14, 98, 686, . . . 12, 8, 4, 0, . . .
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Find the a150 of the following arithmetic sequence18 , 12 , 6 , 0 , …
Find the explicit formula for the following geometric sequence
1.5 , 3 , 6 , 12 , …Find the explicit formula for an arithmetic sequence
given the following informationa3 = 18 a5 = 26
Find the explicit formula and the 9th term of the geometric sequence below400 , 200 , 100 , …
Find the common ratio of a sequence if a6 = 42 and a9 = 4.67
Find the common difference of a sequence given the following:
a5 = 92 and a9 = 114
Find the explicit formula of a geometric sequence given the following, then find a5
a1 = 6 a2 = 3
Find the explicit formula for a geometric sequence given the following a2 = 6 a5 = 20.25
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Test Like Question
For a geometric sequence, a4 = 16 and a8 = 1
Find the common ratio r =
Find the explicit formula an =
Find a6 a6 =