How many sides does a regular polygon have if the measure of an exterior angle is 18⁰

Is the square root of 4 plus the square root of 16 rational?

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?

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)