Javier has a job installing windows. he earns a rate of $75 per day plus $8 per window installed. he also receives a stipend of $25 for snacks. javier knows his weekly earnings can be shown with the following expression: . 75d + 8w + 25. 1..identify a coefficient, a variable, and a constant in this expression.. 2.if javier works for 5 days and installs 48 windows, how much does he earn? . 3. if javier gets an increase in his stipend and receives $40 for snacks, would the coefficient, variable, or constant in the equation change? why?