+0  
 
0
321
2
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Can someone please help me ASAP? I can only take this once

 Jan 27, 2020
 #1
avatar+21907 
+2

n = 1  --->     4(1) + 1  =  5

n = 2  --->     4(2) + 1  =  9

n = 3  --->     4(3) + 1  =  13

...

n = 32 -->     4(32) + 1  =  128

 

This is an arithmetic series with:

a = first term = 5

d = common difference = 4

l = last term = 128

n = number of terms = 32

 

Sum of an arithmetic series:  Sum  =  n(a + l) / 2

 

Place the numbers into the equation and solve.

 Jan 27, 2020
 #2
avatar
0

Geno3141: A slight typo: Last term =128+1=129

 Jan 27, 2020

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