6. let a = {5,7,8,9} and c = {6,7,8). then show that (a\b)\c = a(b\c).

10

step-by-step explanation:

7+3=10

33

step-by-step explanation: g=6

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5