SOLUTION: Please help with quadratic formula problem. Find a quadratic model that represents the data with {{{ t = 4 }}} corresponding to 1994. Which of the following functions best repre

Algebra ->  Test -> SOLUTION: Please help with quadratic formula problem. Find a quadratic model that represents the data with {{{ t = 4 }}} corresponding to 1994. Which of the following functions best repre      Log On


   

Question 1055206: Please help with quadratic formula problem.
Find a quadratic model that represents the data with +t+=+4+ corresponding to 1994. Which of the following functions best represents the data using a quadratic model?
Model: https://s3.postimg.org/fxhkdbw2r/internet_access.png
A.) f(x) = 1.91x^2 + 12.21x + 20.74
B.) f(x) = 1.91x^2 - 12.21x + 20.74
C.) f(x) = 12.63x - 16.53
D.) f(x) = 12.63x - 54.42
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
1994   3
1995   8
1996  14
1997  27
1998  51
1999  63

On your TI-83 or TI-84 graphing calculator:

Press STAT
Press ENTER
Enter 4,5,6,7,8,9 in L1 and 3,8,14,27,51,63 in L2.

Press 2ND STAT
Highlight CALC
Scroll down to QuadReg
Press ENTER several times until you see

y=a2+bx+c
a=1.910714286
b=-12.21071429
c=20.73571429
R2=.983826542

One of your answers has these coefficients a,b, and c
rounded off to 2 decimal places.

Edwin