why must the domain be restricted when finding the inverse of a quadratic function, but not when finding the inverse of a cubic function

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3

What is the probability of throwing several dice with sum equal to 6 (six)? show the ways of possibilities for sum 6 (as the numerator) and the ways of throwing n dices for n = 1, 2, 3, 4 or 5 as denominator for all the questions to earn full credits. (a)throw one die, (b) throw two dice, (c) throw three dice (d) throw 4 dice, (e) throw 5 dice

Solve the system of equations using the linear combination method. {4x−3y=127x−3y=3 enter your answers in the boxes.