What value of x would make AB || CD? Which property is utilized in this proof?

What is the solution to the equation 9^(x+1) =27

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents