Plz help find perimeter and area

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

Travis and paula went to lunch. travis ordered a sandwich for $7.50 and paula ordered a burger for $5.25.after lunch, they left a 15% tip for the waiter. how many money did they spend altogether?

Three lines meet at a point. set up and solve an equation to find the value of (a) is your answer reasonable? explain how you know