A rope is swinging in such a way that the length of the arc is decreasing geometrically. If the first arc is 18 feet long and the third arc is 8 feet long, what is the length of the second arc?
12 feet
10 feet
5 feet
72 feet

Question

A rope is swinging in such a way that the length of the arc is decreasing geometrically. If the first arc is 18 feet long and the third arc is 8 feet long, what is the length of the second arc?  
12 feet
10 feet
5 feet
72 feet

nurali · Answer

let second rope be x..then 
x/18 = 8/x or x^2 = 18 x 8 = 144 x =12...this is the answer

anonymous · Answer

thanks sooooo much! can you help me with another?

nurali · Answer

My Pleasure i will try.

anonymous · Answer

okay one sec :) @Nurali

anonymous · Answer

Use summation notation to write the series 2 + 4 + 6 + 8 + ... for 10 terms.

anonymous · Answer

https://www.connexus.com/content/media/642756-1132012-115954-AM-2087201656.png

anonymous · Answer

thats choice a and at the end its ;2n

anonymous · Answer

B. https://www.connexus.com/content/media/642756-1132012-115954-AM-2087201656.png ; (n + 2)

anonymous · Answer

C. n

anonymous · Answer

D. https://www.connexus.com/content/media/710999-822012-84744-AM-1221067762.gif

nurali · Answer

2+4+.. means its 2 

so the answer is 2n

nurali · Answer

have u got it. @jessicasapimp

anonymous · Answer

yeah sorta. @Nurali

anonymous · Answer

so would it be a or d ?

nurali · Answer

tell me choice a,b,c,d