HELP The cost of Bob's house in 2005 was $220,000. If his house appreciates in
value at a rate of 3.5% every year, what will the price of his house be in 2015?
(looking exponential function)

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.