Find the Term-to-Term Rule in the Sequence: 40, 35, 30

What is the term-to-term rule of the following sequence?

40 ,35, 30

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the sequence formula
00:04 Identify the first term according to the given data
00:12 Note the constant difference between terms
00:17 This is the constant difference
00:23 Use the formula to describe an arithmetic sequence
00:32 Substitute appropriate values and solve to find the sequence formula
00:50 Properly open parentheses, multiply by each factor
00:56 Continue solving
01:02 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

What is the term-to-term rule of the following sequence?

40 ,35, 30

2

Step-by-step solution

To solve this problem, we'll identify the term-to-term rule for the given sequence: 40, 35, 30.

Step 1: Calculate the difference between consecutive terms.
The second term (35) is 5 less than the first term (40): 3540=535 - 40 = -5.
The third term (30) is 5 less than the second term (35): 3035=530 - 35 = -5.
The difference between consecutive terms is consistent at 5-5.

Step 2: Express the term-to-term rule.
Since each term is obtained by subtracting 5 from the previous term, the term-to-term rule is:
"Subtract 5 from the previous term to get the next term."

Step 3: Compare to given answer choices.
The correct expression is consistent with choice 1: 455n 45-5n . This expression generates the sequence by considering n n starting from 1.

Therefore, the term-to-term rule for the sequence is correctly represented by the formula 455n 45-5n .

3

Final Answer

455n 45-5n

Practice Quiz

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Is there a term-to-term rule for the sequence below?

18 , 22 , 26 , 30

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