If a universal set A contains the following elements: A = { 1, {b, c}, 4}. Determine the number of proper subsets that can be found. ​

Sum of the interior angles of a pentagon

The random variable x is defined as the number marking the sector in which the arrow lands when the spinner in the diagram is spun once.

Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?