1) 1/4 ; 2) 2 ; 3) 15 ; 4) 7 .
2) -( 5 ,3)⁰* 2 = - 1*2 = -2. [ ! ≠ ( - 5,3)⁰* 2 = 1*2 =2 ] ; 4) - 1 /7 .
omg it was 5,3 :D
I hope this helps you