In triangle $PQR,$ $\angle P = \angle Q + \angle R.$ Of all three exterior angles of triangle $PQR,$ what is the least exterior angle, in degrees?

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

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?