What is the value of "X"?​

What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

Which is the correct excel formula for the 80th percentile of a distribution that is n(475, 33)? =norm.dist(80,475,33,1) =norm.inv(0.80,475,33) =norm.s.inv((80-475)/33)?

When only separate discreet points are graphed it is called?