Question

I need help, can anyone help?

Answer 1

hmmm do you know how to do a quadratic regression in a calculator?

Answer 2

you have 4 functions, thus each of them have their own (x,y) pair coordinates values

so I gather the regression will be used to get an amalgamated version of all 4
so
I'd pick 2 points from each function, to give the quadratic regression table to get the equation

Answer 3

no I don't

Answer 4

Could you tell me the algebraic model?

Answer 5

http://www.youtube.com/watch?v=74bdyEF6Ugw <----

Answer 6

shows more or less how to do the quadratic regression, that one uses a TI84, but is more or less the same on any TI or graphing calculator

so when entering the values for the table, enter 2 points of each of the 4 functions you have, so you end up with an amalgamated function from the regression