Which two ratios form a proportion? a) 3 : 4 and 6 : 12 b) 3 : 4 and 9 : 15 c) 3 : 4 and 12 : 18 d) 3 : 4 and 15 : 20

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?