25-01-2019
Mathematics

contestada

a recursive rule for an arithmetic sequence is a1=-4 an=4+a (n-1)
What is the 4th term?

Respuesta :

28-01-2019

Answer:

4th term is 8

Step-by-step explanation:

[tex]\left\{\begin{array}{ccc}a_1=-4\\a_n=4+a_{n-1}\end{array}\right\\\\a_2=4+a_1\to a_2=4+(-4)=4-4=0\\\\a_3=4+a_2\to a_3=4+0=4\\\\a_4=4+a_3\to a_4=4+4=8[/tex]

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