+0  
 
+1
212
2
avatar+3460 

Help.

NotSoSmart  Nov 29, 2017
 #1
avatar+90053 
+1

The first is a little difficult, but we might be able to eliminate some answers

 

The point ( 1 , -1)  is on the graph

 

Note that if we substitute 1 into the polynomial, we can add the coefficients and constant of each polynomial and should come up with -1

 

So...look at the first answer...we add  2 - 3 - 2  + 1  =  -2   so this is not the answer

Look at the third answer....we add  1 - 2 + 3 + 2 - 1  =  -3  so this is not the answer

 

Now...look at the second  answer...if we put 4 into the function, we get

 

(4)^4 -2(4)^3 - 3(4)^2 +2(4) + 1  =   256 - 128 - 48 + 8 + 1  =  89

 

But we should get   329

 

So......the fourth answer is correct

 

 

cool cool cool

CPhill  Nov 29, 2017
 #2
avatar+90053 
+1

 

Here's my best guess for the second one....assuming that x  is the number of years after 1900, the correct function is third one......see the outputs here for this function  [rounded to the nearest integer ]

 

https://www.wolframalpha.com/input/?i=.139x+%2B+6.57++for+x++%3D+37,+68,95

 

 

cool cool cool

CPhill  Nov 29, 2017

4 Online Users

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.