Determine if each of the following is a function or not

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Need on this one asap im almost done with this subject

What is the graph of the function fx x+2/x-3?