What is the greatest common factor of 12x^3 - 9x^2?

A) 3x

B) 6x

C) 3x^2

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?