The inequality mathleqmath is called a weak inequality while the inequality mathltmath is called a strong inequality. The terms weak and strong are used in a few ways connected by the idea that strong implies weak. The distance is always positive as absolute value of a number cannot be negative.
Absolute value refers to the distance of a number from zero regardless of direction.
Add up a series of numbers and divide the sum by the total number of values to find the mean. In our reading example you took 40 and added 0. The zero exponent rule is one of the rules that will help you simplify exponents. The absolute value is always a positive number except for zero as zero is neither positive or negative.