What is the simplified form of each expression?
 1).
 A) 1 
 B) 0 
 C) -5.1
 D)-1
 2). 3g^-2 b^2
 A) 3b^2/b^2
 B) 3g^2 b^-2
 C) 3gb^-4
 D) b^2/3g^2
 3). 3/g^-2 h^3
 A) 3/g^2 h^3
 B) 3g^2/h^3
 C) 6^g/h^3
 D) 3/gh
 4). What was the value of 2x^-2y^-2 for x=3 and y= -2
 A) 1/18
 B) 72
 C) 2(-6)^-4
 D) 1/648
 5). What was the value of 1/2^-2 x^-3 y^5 for x=2 & y= -4 
 A) 16
 B) -4
 C) -1/32
 D) -16