Arithmetic 61123

In the arithmetic sequence (an), determine a1, d if: a6 = -3, a15 = -8

Correct answer:

d =  -0.5556
a1 =  -0.2222

Step-by-step explanation:

a6=3 a15=8  a15 = a6 + (156) d  d=156a15a6=156(8)(3)=95=0.5556
a6 = a1 + 5d a1=a65 d=(3)5 95=920.2222   Verifying Solution:  x6=a1+5 d=92+5 95=3 x15=a1+14 d=92+14 95=8



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