S is the set of all positive integers that can be written in the form 2" .3", where n and m are positive integers. If a and b are two numbers in S, which
of the following must also be in S?

A) a+b
B) ab
C) a/b
D) sqr ab

What is the value of x in the following equation. -x ^3/2 = -27

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?