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CBSE Class 8 Answered

  • rehman invested 10000 rupees for a business.after one year  he noticed that his profit was 1 by 8th of his capital investment.he invested this profit also into his capital.after the end of this year,he found that his profit was -1 by 8th of his present capital.find his profit at the end of the year.

 

  • on a bright morning, delicia observed that her rose garden had one flower.on the second day,she observed that there were three flowers.on the third day,she saw nine flowers and on the fourth day she saw27 flowers.if this pattern continues,how many flowers will be there on the 20th day?express the answer in exponential form.
Asked by Trisha Gupta | 04 Sep, 2019, 01:25: PM
Expert Answer

 
According to the information given in the question, we get
 
1, 3, 9, 27, ..........
 
This can be written as
 
30 ,31 , 32 ,33 , ........ 3n-1
 
 
On the first day delicia observed 30 flower.
On the 2nd day delicia observed 31 flowers.
On the 3rd  day delicia observed 32 flowers.
On the 4th  day delicia observed 33 flowers.
.
.
.
On the nth  day delicia observed 3n-1 flowers.
 
Therefore on the 20th day delicia observed 320 - 1 = 319 flowers.

Answered by Yasmeen Khan | 05 Sep, 2019, 06:57: PM
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