What is the mean absolute deviation
of the following set of data?
12
6
10
10
2
4
6
12
Please explain how you got the answer.

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Every rhombus is a square. true false

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β