Given a set of 2x2 matrices, how can i determine if they span the vector space m22?

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

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account