Find the slope of the lines shown in the graph

For which rational expression is -2 an excluded value of x?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

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. how many hours after the truck's departure will the two meet?