Someone help me this is urgent. I could die if this doe not get resolved thank you

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

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Ben frank is an electrician who installs lighting fixtures. he charges (in dollars) his clients 15h+40f15h+40f where hh is the number of hours worked and ff is the number of fixtures installed. how much does ben frank charge when he works 77 hours and installs 99 fixtures?