What is the included side of RST that is between STR and RST?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39