+0  
 
0
85
2
avatar+2206 

Help.

NotSoSmart  Feb 1, 2018
Sort: 

2+0 Answers

 #1
avatar+85757 
+2

3.

 

Area   =  pi * r^2   ....so  we have

 

108.94  =  pi * r^2      divide both sides by pi

 

108.94 / pi  = r^2      take the square root of both sides

 

√ [ 108.94 / pi ]  =  r  ≈  5.89 ft 

 

 

4.  Note, NSS....we don't need to do much math here....logic will suffice

 

From  a  positive radical on the right, we CANNOT  get a negative answer....thus....the 5x  on the left side CANNOT evaluate to a negative whenever we plug in  an x value.....thus, x CANNOT be negative

 

Notice that the first, second and fourth answers will produce at least one negative outcome for 5x

 

So....by a process of elimination, the second answer is the only one that is any good

 

Do you see that???.....sometimes....logic is BETTER than MATH  !!!

 

 

cool cool cool

CPhill  Feb 1, 2018
 #2
avatar+2206 
+2

wow i do see oh my gosh you make it so simple more!! thank you so much

NotSoSmart  Feb 1, 2018

30 Online Users

avatar
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