While state requirements vary on the number of instructional days and/or hours in the school year, the majority of. states require 180 days of student instruction. Most also specify the minimum length of time that constitutes an. instructional day.
Media Mix. Definition: Media Mix. Media Mix refers to the combination of advertising channels that is used in the promotion of a particular good or service. The idea is to choose the right combination to communicate with the audience and make an impact as estimated in the media planning strategy.
Selective Media . Complex or defined media will also be cl assified as âselectiveâ if they support the. growth of only certain types of bacteria. Media can be made selective through the addition of. substances that enhance or inhibit the growth of particular types of bacteria.