Sequence 3

Write the first 5 members of an arithmetic sequence: a₄=-35, a₁₁=-105.

Correct answer:

a₁ =  -5
a₂ =  -15
a₃ =  -25
a₄ =  -35
a₅ =  -45

Step-by-step explanation:

$$\begin{gathered} -35=a_1+(4-1)d \\ -105=a_1+(11-1)d \\ d=-10 \\ {a}_1=-5 \end{gathered}$$

$a_2=a_1-10=-15$

$a_3=a_2-10=-25$

$a_4=a_3-10=-35$

$a_5=a_4-10=-45$

Try another example

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