If x-5=12, what is the value of x-9?

Find the multiplicative inverse of 8-12i

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?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?