10+ 6 has the same sum as 7+

What is the volume of the sphere shown below with a radius of 3?

What are the soultion(s) to the quadratic equation 40- x^2=0

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?