Naming angles

Worth 20 points

Can someone me i’m confused. will give brainliest and a whole bunch of points

Evaluate the expression for the given value of the variable 7a - 4a for a =8

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?