English | Español

# Try our Free Online Math Solver! Online Math Solver

 Depdendent Variable

 Number of equations to solve: 23456789
 Equ. #1:
 Equ. #2:

 Equ. #3:

 Equ. #4:

 Equ. #5:

 Equ. #6:

 Equ. #7:

 Equ. #8:

 Equ. #9:

 Solve for:

 Dependent Variable

 Number of inequalities to solve: 23456789
 Ineq. #1:
 Ineq. #2:

 Ineq. #3:

 Ineq. #4:

 Ineq. #5:

 Ineq. #6:

 Ineq. #7:

 Ineq. #8:

 Ineq. #9:

 Solve for:

 Please use this form if you would like to have this math solver on your website, free of charge. Name: Email: Your Website: Msg:

The following table lists the tuition cost per quarter for taking 15 credits at Green River Community
College since 1980.

 Year Cost 1980 \$102 Year Cost 1981 102 1994 \$432 1982 173 1995 450 1983 173 1996 467 1984 193 1997 486 1985 193 1998 505 1986 233 1999 528 1987 253 2000 547 1988 260 2001 581 1989 274 2002 661 1990 294 2003 714 1991 320 2004 771 1992 333 2005 815 1993 375 2006 862 Use your calculator ’s linear regression function to find a line of best fit for the data. What is
the linear function of best fit? (Hint: It might make things easier if you use ‘years since 1980’ as
the variable x instead of the year number – so 1980 would be x = 0, and 2006 would be x = 26.) Use the function you found in part 1 to estimate the cost of taking 15 credits at GRCC in 2007.
Also estimate the cost in 2010 and 2020. Plot both the data and the line on your calculator to see how well it fits. Does it look like a
good fit to you? Next, use your calculator to find a quadratic regression for the data. What is the quadratic
function of best fit? Plot the data and your quadratic function on your calculator. How well does it fit? Does it look
like it fits better than the line does? Now use the quadratic function to try to predict the cost of taking 15 credits at GRCC in 2007,
2010 and 2020. Do you think the linear function or the quadratic function gives a better prediction? Why?

 Prev Next