1/9 y -5 = - 7 what does Y equal?

If jm equals 5x -8 and lm equals 2x -6 which expression represents jl

If set d is not the empty set but is a subset of set e, then which of the following is true? d ∩ e = d d ∩ e = e d ∩ e = ∅

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?