Greatest factor of the term 10m^5 and 40m^8

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?

Put the equation in slope intercept form by solving for y