Circle the division problem that does not belong with the other three. Explain. Write one that does belong 621/6 384/3 719/7 514/5

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?