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A sequence has a common difference

A sequence has a common difference of D=-4 so if A2=-5 what is A5
 
A. -9 
B. -13 
C. -17 
D. -21
 

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Callie H. | National Board Certified Teacher can help you/your child in all areasNational Board Certified Teacher can hel...
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The common difference is -4, so you will go down 4 each time.  If the second number in the sequence (A2) is -5, A3 would be -9 (-5-4).  A4 would be -13 (-9-4).  A5 would be -17 (-13-4).