Plz help i have 9 min and i dont understand plz help worth 20 points

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

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the plzzz write a proportion i will give you 100 points

Asporting good store is offering 30 percent off of the original price(x) of football cleats. the discount will be reduced by an another $7 before sales tax.