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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?

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie