Can I have some help please

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

Brent works part-time at a clothing store. he earns an hourly wage of $15. if he needs to earn more than $45 in a day and works for x hours a day, which inequality represents this situation? a. 15x > 45 b. 15x < 60 c. x > 60 d. 15x < 45 e. x < 60

Find the equation using the point (4,8)