Hi, Please help me with the following Questions, I will mark and 5 stars, THANKS :)

Find an equation of the line perpendicular to the graph.

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

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?