What does b represent? what id the value of b

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

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

What is the measure of sty in oo below? 130 310 230 50