Around 1450, Johann Gutenberg was the first to bring together the complex systems and subsystems necessary to print a typographic book, including a thick, tacky ink that could be smoothly applied and did not run off the metal type; a strong, sturdy press; and a metal alloy that was soft enough to cast yet hard enough to hold up for thousands of impressions. But the key to his invention was the used for casting the individual letters.

Type mold

Explanation:

Around 1450, Johann Gutenberg was the first to bring together the complex systems and subsystems necessary to print a typographic book, including a thick, tacky ink that could be smoothly applied and did not run off the metal type; a strong, sturdy press; and a metal alloy that was soft enough to cast yet hard enough to hold up for thousands of impressions. But the key to his invention was the type mold used for casting the individual letters.

frederick the great and the war of austrian succession. frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. he also declared himself king of bohemia, and maria theresa sent troops to retake bohemia. in august he led 80,000 of these men across the frontier into bohemia, his

answer: alexander hamilton

explanation: alexander hamilton was george washington's right hand man. he took an early role in the militia as the american revolutionary war began. in 1777, he became a senior aide to general washington in running the new continental army.