Can someone solve this and show it step by step

−5x + 2[x − (4 + 2x)] ≥ 5 − 2(x − 1)

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?