Answer:
Secretary of Commerce
Explanation:
Prior to becoming President, Herbert Hoover was Secretary of Commerce and helped to develop many of the systems that are used still to regulate the airwaves.
The independent variable in this study is marriage counseling
An independent variable is that which does not change in a study, while the dependent variable is that which is affected by the independent variable, while itself, it does not affect the independent variable to change. in this study, the independent variable is marriage counseling,while divorce is the dependent variable.
Mnemonic Device
Any system that helps retain information falls under the category of mnemonic device. Another example of this is when remembering the order of operations in math (PEMDAS) Please Excuse My Dear Aunt Sally.
Explanation:
The plantation system developed in the American South as the British colonists arrived in Virginia and divided the land into large areas suitable for farming. Because the economy of the South depended on the cultivation of crops, the need for agricultural labor led to the establishment of slavery.
