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Help #10,14,17

NotSoSmart  Mar 20, 2018
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10)

 

We have  the common ratio  of  1/5

 

625 (1/5) n - 1      where n is the nth term

 

625 (1/5)10-1

 

625 (1/5)9   =   1  /3125

 

 

14)  

 

First term  =   5(1)  - 4  =  1

Last term  =  5(18) - 4  =  86

 

Sum  =   [ 1 + 86 ]  (18/2)   =  87 * 9   =  783

 

 

14) 

 

Total  vertical distance    =

 

  20  [ 1 - (4/5)^(5) ]  / ( 1 - 4/5)  - 10    =  7154 / 125   =   57 + 29/125  ft

 

 

cool cool cool

CPhill  Mar 20, 2018

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