Please help me! asap!

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

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

What is the point slope form of a line with slope -5 that contains point (2,-1)