Ireally need with these questions plzzz! 2-4

Astudent received the following grades last semester. find the student's semester grade point average. an a is algebra (3 credits), a b in history ( 3 credits), a in sociology ( 3 credits) a d in english ( 3credits) and a c in seminar ( 2credits). an a is worth 4 points, a b is worth 3 points a c is worth 2 points and a d is worth 1 point.

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?