Find the cosine of ∠I. Write your answer in simplified, rationalized form. Do not round.
cos (I) =

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

87.5% , 100% , 83.33 , 93.33% , 100% , 82.5% are all the academic points i've gotten this quarter. what's my final grade?