+0  
 
0
669
2
avatar+116 

Find a10 of the arithmetic sequence: -4,2,8,14,20

the formula is : an=a1+(n-1)d

so is this correct: a10=-4+(10-1)+6=11?

 May 4, 2016
 #1
avatar
+5

Find a10 of the arithmetic sequence: -4,2,8,14,20

the formula is : an=a1+(n-1)d

so is this correct: a10=-4+(10-1)+6=11?

 

You have your formula of:an=a1+(n-1)d

a10=-4 + (10 -1) x 6=50. Why did you change d to + instead of X??.

 May 4, 2016
 #2
avatar+116 
0

Oh right I guess because the sequence was adding 6 I put a + sign. thank you for ur help!laugh

 May 4, 2016

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