itsmee12333 itsmee12333
  • 04-07-2018
  • Mathematics
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I will never get the hang of these questions help

I will never get the hang of these questions help class=

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jimthompson5910 jimthompson5910
  • 04-07-2018
First term is -7, so a_1 = -7

To get the next term, we add on 4. We can see this if we subtract like so
d = (2nd term) - (1st term) = (-3) - (-7) = -3+7 = 4

So d = 4 is the common difference. 

Apply a_1 = -7 and d = 4 to get...
a_n = a_1 + d*(n-1)
a_n = -7 + 4*(n-1)
a_n = -7 + (n-1)*4

Answer: Choice A
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