5. On a number line, locate and label 40°C below zero and 40°C above zero. What does zero represent in this situation?

How did industrialization change life in the united states?

In in 1958, the aarp was organized to promote a mandatory retirement age of 65health insurance for retired americansactivism for native americansemployment opportunities for the disabled

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.