Causal models select one: a. provide evidence of a causal relationship between an independent variable and the variable to be forecast. b. occur whenever all the independent variables are previous values of the same time series. c. relate a time series to other variables that are believed to explain or cause its behavior. d. use the average of the most recent data values in the time series as the forecast for the next period.

Efficient homemakers ltd. makes canvas wallets and leather wallets as part of a money-making project. for the canvas wallets, they need two yards of canvas and two yards of leather. for the leather wallets, they need four yards of leather and three yards of canvas. their production unit has purchased 44 yards of leather and 40 yards of canvas. let x be the number of leather wallets and y be the number of canvas wallets. draw the graph showing the feasible region to represent the number of the leather and canvas wallets that can be produced.