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Questions and Answers
What is the common difference in the arithmetic sequence where the third term is 11 and the sixth term is 47?
What is the common difference in the arithmetic sequence where the third term is 11 and the sixth term is 47?
The first term of the arithmetic sequence in Example 1 is 11.
The first term of the arithmetic sequence in Example 1 is 11.
False
How many terms are there in the arithmetic sequence that starts with -38 and ends with 14?
How many terms are there in the arithmetic sequence that starts with -38 and ends with 14?
27
In the arithmetic sequence, the common difference d was found to be ____.
In the arithmetic sequence, the common difference d was found to be ____.
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Match the following terms with their definitions:
Match the following terms with their definitions:
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Study Notes
Arithmetic Sequence Formulas
-
General Form: tn = a + (n-1)d
- tn = nth term
- a = first term
- n = term number
- d = common difference
Finding a and d
- Given t3 = 11 and t6 = 47:
- t3 = a + 2d = 11
- t6 = a + 5d = 47
- Subtracting the first equation from the second: 3d = 36, therefore d = 12
- Substituting d = 12 into the first equation: a + 2(12) = 11, therefore a = -13
Finding the number of terms
- Given the sequence -38, -36, ... , 14:
- a= -38, d = 2
- tn = 14
- 14 = -38 + (n - 1)(2)
- 52 = (n - 1)(2)
- 26 = n - 1
- n = 27
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Description
This quiz covers the essential formulas for arithmetic sequences, including the general form for finding the nth term and how to calculate the first term and common difference. You will work through examples to determine the number of terms in a given sequence. Test your understanding of these foundational concepts in mathematics!
