Hey can someone help me ?Which graph shows a function whose inverse is also a function?

Vinay constructed this spinner based on the population of teachers at his school according to vinays model what is the probability that he will have a male history teacher two years in a row

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left