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May 27th, 2013, 01:20 PM  #1 
Newbie Joined: May 2013 Posts: 14 Thanks: 0  arithmetic progression
I have attached the questions...please someone help me out.[attachment=0:yfamvqou]698.png[/attachment:yfamvqou]

May 27th, 2013, 02:23 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,747 Thanks: 2133 
Each successive speed after the slowest is 10% greater than its predecessor. This suggests that the speeds form a geometric progression, not an arithmetic progression. The nth term in the geometric progression would be 2000(1.1^(n1))rpm, which you can evaluate for n = 5, 6 and 7 in order to answer part (a) of the problem. 

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