3/4? real rational irrational integer whole counting ?

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

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

If a is a nonzero real number then the reciprocal of a is