+0  
 
-1
56
7
avatar+-291 

How many numbers are in the list$\($ 1.5, 5.5, 9.5, 13.5, \ldots, 41.5, 45.5? $$\)

 Mar 30, 2020
 #1
avatar+632 
+1

OOPS, mistake fixed!

Goal:

 - Find the number of terms

Solving:

Number of terms = 45.5 - 1.5 + 1 = 45

 

ceiling (45/11) = 12

 

Why:

Example:

1, 2, 3

 

3 - 1 + 1 = 3

 Mar 30, 2020
edited by AnExtremelyLongName  Mar 30, 2020
 #5
avatar+111321 
+2

We  have  this  

 

1.5 +  4 ( n - 1)   =  45.5      subtract  1.5 from both sides

 

4 ( n - 1)   =  44       divide both sides  by  4

 

n -  1   =  11         add 1 to both sides

 

n    =   12    (numbers)

 

 

cool cool cool

 Mar 30, 2020

17 Online Users

avatar