Can somebody help me?

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?