the firing managers recognize that the funding for one employment source depends on the funding for the other sources. Therefore, they want you to perform a multiple regression predicting Social Network funding from Months $1-12,$ while controlling for the funding of Billboard, Careerbuilder, Company Intranet $-$ Partner, and Diversity Job Fair. Assume that we know the funding for the controlled variables for month $13.$ They are: Billboard: $520$ Careerbuilder: $800$ Company Intranet: $0$ Diversity Job Fair: $1000$ For this model and these know values, what is the predicted value for Social Network funding for month $13$