25 points - Can anyone solve this pls?? ty so much

Arestaurant charges $100 to rent its banquet room for an event. it also charges $15 to serve dinner to each guest. write an equation for the total cost of the banquet room in terms of the number of guests. deine your variables. what is the total cost of the banquet room for 20 guests?

Joe has 45 minutes before he has to go to soccer practice he spends 20 minuets eating a snack and the rest of the time doing his homework write an equation to express how long joe spent doing his homework

Asap 30 pts + brainliest to right/best answer