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0
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avatar+2509 

Help 14

NotSoSmart  Mar 19, 2018
 #1
avatar+87656 
+2

14

First term  =  6(1) - 4  =  2

16th term  =  6(16) - 4  =  92

Sum  = 

(first term + last term) (number of terms) / 2  =

 (2 + 92) * 16/2  =   94 * 8   = 752   

 

 

15.  Similar to 14

First term  = 4(1) - 3  = 1

!0th term  = 4(10) - 3  =  37

Sum  =

(1 + 37) * 10/ 2  =

38 * 5  =

190

 

 

cool cool cool

CPhill  Mar 19, 2018

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