PLZ HELP Find the variance for the given data. Round your answer to one more decimal place than is present in the original data.
18 20 18 27
63.9
99.2
51.2
64.0

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

Find the solution to this system 2,1 1,-2 1,2 -1,2