+0  
 
0
34
1
avatar+138 
  • The formula for the nth square number is Sn =n2.

Use the formula to find the 19 square number.

 

The 19 square number is =

 

  • It takes you 51 seconds to walk from the first  (ground) floor of a building to the third floor. How long will it take you to walk from the first floor to the sixth floor  (at the same pace, assuming all floors have the same height)?

 

It will take seconds to walk from the first floor to the sixth floor.

 

  • Cindy was asked by her teacher to subtract 3 from a certain number and then divide the result by 9. Instead, she subtracted 9 and then divided the result by 3, giving an answer of 40. What would her answer have been if she had worked the problem correctly?

 

The answer would be if she had worked the problem correctly.

cassie19  Sep 6, 2017
Sort: 

1+0 Answers

 #1
avatar+76094 
+2

 19^2   =  361

 

Each floor  takes  [ 51] / [ 3 - 1]  =   51/2  =  25.5  seconds

So....... from the first to the sixth - 5 floors -  takes     5 * 25.5  = 127.5 seconds 

 

 

Cindy was asked by her teacher to subtract 3 from a certain number and then divide the result by 9. Instead, she subtracted 9 and then divided the result by 3, giving an answer of 40. What would her answer have been if she had worked the problem correctly?

 

[ N - 9] / 3  =  40   multiply both sides by 3

 

N - 9  =  120       add 9 to both sides

 

N  = 129

 

So....the correct answer should be

 

[ 129 - 3 ] / 9  =   126 / 9  =   14

 

 

cool cool cool

CPhill  Sep 6, 2017

29 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details