Members Login
Username 
 
Password 
    Remember Me  
Post Info TOPIC: Questions
Anonymous

Date:
Questions
Permalink   


Back again.

So, here goes:

21. How many odd integers are between nine and 46? //Is there any trick to these? or do you just count?

70* 4.1^3 * 5.1^3
72. The sum of the first nine terms of 1 + 3 + 4 + 7 + ... is?

Thanks

__________________
Anonymous

Date:
Permalink   

oh, and
on 69. 555/27, is there any trick to it or do you just work it out?

thanks again

__________________
Anonymous

Date:
Permalink   

21. How many odd integers are between nine and 46? //Is there any trick to these? or do you just count?


there's a trick for it. if it says between two numbers, you do the larger number- smaller number, subtract the difference by how many odd/even (depending on the problem) are in the ending numbers, then divide by 2. ok, i know it's not very clear, so let me do an example


21. How many odd integers are between nine and 46?


larger number 46- smaller number 9= 37, 37 - 1 (only 9 is an odd number, 46 is not, so you subtract only 1)= 36, 36/2 = 18


ex 2  How many odd integers are between nine and 47?


47-9-2(because both 9 and 47 are odd)=36/2=18

70* 4.1^3 * 5.1^3


4^3*5^3, then round up some



72. The sum of the first nine terms of 1 + 3 + 4 + 7 + ... is?


ah...i am in a class and it's about over...gtg, i'll answer it later


 


quincy



__________________
Anonymous

Date:
Permalink   

The sum of the first nine terms of 1 + 3 + 4 + 7 + ... is?


555/27, is there any trick to it or do you just work it out?


i think those 2 problems are new this year...and thus can't be talked about on the forum...if not, go ahead pm and i'll write the trick down. but i can tell you that the sum of the 1st 10 terms in a fib. sequence is the 7th term x 11


quincy



__________________
Anonymous

Date:
Permalink   

On 555/27:


540 is 27 * 20, so answer is 20 and 15/27 which reduces to 20 5/9. I think that it can be worked out quickly enough w/o a special trick.



__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.

Tweet this page Post to Digg Post to Del.icio.us


Create your own FREE Forum
Report Abuse
Powered by ActiveBoard