I need this points for algebra help please

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

The probability that you roll a two on a six-sided die is 1 6 16 . if you roll the die 60 times, how many twos can you expect to roll