Sammy can run 3 1/2 feet in 2 seconds what is his unit rate ( feet per second)

Can some one me with this math problem?

Find the vertex of the function given below y=x^2-6x+1

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