How much would 6 board foot cost at $3.25?

Which one ? is the answer and how to find this answer

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?