Which one is the correct the the muslims who traveled to new regions for the sole purpose of converting people to islam were known as a)caliphs. b)merchants. c)nomads. d)missionaries. one of my friends tell me that the option a is incorrect

Technician a says that the sine with dwell (swd) test is used to determine if an electronic stability control system functions normally. technician b says that the esc lamp, called a telltale light, is required to remain on for two minutes. who is correct?

Was the first african american to be appointed to the u. s. supreme court.

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.