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If a sequence is defined by a_n = 2n + 1, what is a_4?
If a sequence is defined by a_n = 2n + 1, what is a_4?
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Q1
If a sequence is defined by a_n = 2n + 1, what is a_4?
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a_4 = 2(4) + 1 = 8 + 1 = 9.
Questions & Step-by-step Solutions
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Q: If a sequence is defined by a_n = 2n + 1, what is a_4?
Solution:
a_4 = 2(4) + 1 = 8 + 1 = 9.
Steps: 5
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Step 1: Identify the formula for the sequence, which is a_n = 2n + 1.
Step 2: Substitute n with 4 in the formula to find a_4. So, we have a_4 = 2(4) + 1.
Step 3: Calculate 2 times 4, which is 8.
Step 4: Add 1 to the result from Step 3. So, 8 + 1 equals 9.
Step 5: Therefore, a_4 is 9.
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