What symbol is used to identify the standard error of m? ?

The correct answer is: 
 
Explanation:
σ is a Greek letter, which is called a lowercase sigma. In order to express the standard error of m in an equation, we use σ_M. For example, the formula of the standard error of mean is given as follows:



Where, N = sample size
σ = standard deviation

A)26•2=52there are 2 sides with the same length116-52=64the other 2 side have to be half of 64 each64/2=32the width is 32b)make two sentences about these steps because your teacher knows how you write and explain things.