Evaluate 8r-rs8r−rs8, r, minus, r, s when r=6r=6r, equals, 6 and s=5s=5s, equals, 5.

How do you find the area of a triangle

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.

Solve the problem by making up an equation. a man could arrive on time for an appointment if he drove the car at 40 mph; however, since he left the house 15 minutes late, he drove the car at 50 mph and arrive 3 minutes early for the appointment. how far from his house was his appointment?