30 points! i need this to be done in less then an hour if you canme ! then after these five questions i have a few more

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

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.

Consider the input and output values for f(x) = 2x - 3 and g(x) = 2x + 7. what is a reasonable explanation for different rules with different input values producing the same sequence?