Math help needed 25 points and brainliest to whoever helps me get the correct answer!! Pls and Thank you.

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.

What is the interquartile range of this data set? 2, 5, 9, 11, 18, 30, 42, 48, 55, 73, 81

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42