In a certain arithmetic sequence, a5=12 and a6=16. What is a1?
Answer:
Explanation:
The nth term of an arithmetic sequence is obtained using the formula:
[tex]a_n=a_1+(n-1)d[/tex]Given the following:
[tex]\begin{gathered} a_5=12\implies a_1+4d=12 \\ a_6=16\implies a_1+5d=16 \end{gathered}[/tex]Subtracting, we have:
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