Danielle needs to earn $250 to pay for her vacation. She has $28 saved and she earns $12 per hour after taxes as a lifeguard. How many hours does Danielle need to work to pay for her vacation?
A: 8.5 hours
B: 18.5 hours
C: 20.83 hours
D: 23.167 hours

Which answer choice listed below is thewhich answer choice listed below is the inverse function of ƒ(x) = x-3 x+3 , x ≠ -3? a) ƒ-1(x) = 3 ( x+1 x-1 ), x ≠ 1 b) ƒ-1(x) = -3 ( x+1 x-1 ), x ≠ 1 c) ƒ-1(x) = 3 ( x-1 x+1 ), x ≠ -1 d) ƒ-1(x) = -3 ( x-1 x+1 ), x ≠ -1inverse function of ƒ(x) = x-3 x+3 , x ≠ -3?