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Let $S=15.247 \div 14.85 + 18.1$ . How much larger is  if you round each of these numbers to the nearest ten before calculating $S$ than if you round each to the nearest whole number?

 

 

Thank you in advance!

 Mar 22, 2021
 #1
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I also have one more question:

 

Let n be a positive integer and a, b be invertible integers modulo n such that a = b^-1 (mod n). What is the remainder when a*b is divided by n?

 

Thank you in advance!

 Mar 22, 2021
 #2
avatar+121003 
+1

Rounded to nearest  10, we  have

 

(20  /  10 ) + 20   = 

2 + 20  =  

22

 

Rounded to nearest whole number

 

( 15   / 15)  +   18  =

1  +  18  = 

19

 

22  -  19   =    3

 

 

cool cool cool

 Mar 22, 2021

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