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Explain help #1

 Mar 12, 2018
 #1
avatar+101746 
+1

1.  Sum  =   ( First term + Last term) * (number of terms) / 2  =

 

(44 + 26) * (7/2)  =

 

(70) / 2 * 7 =

 

35 * 7  =

 

245

 

 

2. Similarly

 

(7.6 +   -1.5) * 8 /2  =

 

(6.1) * 4  =

 

24.4

 

 

cool cool cool

 Mar 12, 2018

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