+0  
 
0
37
6
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Evaluate

0.30+0.31+0.32+0.33+0.34...+0.47+0.48+0.49+0.50
Express your answer as a decimal.

 Feb 8, 2020
 #1
avatar
0

sumfor(n, 30, 50, n/100) = 8.4

 
 Feb 8, 2020
 #2
avatar+26 
+1

This should be easy. Multiply the expression by 100 then group then divide. Steps:

30+31+32+...+49+50

80 x 10

800

800/100=8

 
 #3
avatar
0

it is easy

I was just tricking you

 
Guest Feb 8, 2020
 #4
avatar+26 
0

lol.cheeky

 
 #5
avatar+18229 
0

This is an arithmetic series, first term = 0.30, last term = 0.50, with the number of terms = 21.

 

A formula for the sum of an arithmetic series is:  Sum  =  [ number · (first + last) ] / 2

                                                                             Sum  =  [ 21 · (0.30 + 0.50) ] / 2

                                                                             Sum  =  8.40

 

This can be checked by summing all the individual terms.

 
 Feb 8, 2020
 #6
avatar+20216 
+1

From a sigma calculator:

 

 
 Feb 8, 2020

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