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 part a: identify a coefficient, a variable, and a constant in this expression. (3 points) part b: if javier works for 5 days and installs 48 windows, how much does he earn? show your work to receive full credit. (4 points) part c: if javier gets an increase in his stipend and receives $40 for snacks, would the coefficient, variable, or constant in the equation change? why? (3 points)