1)Price of COke

2)Price of Pizza
3)Price of Beef
4)Quantity of Beef
5)Income

1) List and explain each of the components of you regression model, both the dependent and independent variables
2) list each of the indepedent variables, and hypothesize the sign of coefficients and explain why negative or postive

3) explain model with formula--
Qd=a+b*Pa+c*Pb+d*Income

I have know idea how to use formula with all those variables

anyone?