+0

4) For the sum -10 -13 -16 -... -43: I need someone to solve this which is important to me please!

+1
194
1
+956

4) For the sum -10 -13 -16 -... -43:

(a) Rewrite the sum using summation notation ($$\sum$$).

(b) Evaluate the sum.

Nov 23, 2019

#1
+111376
+2

(a)

12

∑    -7 - 3n

n  = 1

Note that other forms are possible.....

(b)  The sum can be found as

[ First Term + Last Term ] *  [ Number of terms] / 2

The number of terms is   [  43 - 10 ] / 3  + 1 =   33/3 + 1 =  11 + 1 = 12

So....the sum is

[ -10 + -43 ] * [ 12 / 2]  =

] -53] * 6  =

-318

Nov 23, 2019