In 1603, German astronomer Christoph Scheiner began to copy and scale diagrams using an instrument that came to be known as the pantograph. By moving a pencil attached to a mechanical assembly, Scheiner was able to produce a second image that was identical to the first but enlarged. Do some brief research on Scheiner’s invention. What shape is the mechanical assembly based on? How does the operation of the pantograph relate to dilations and similarity?

international economic development agencies harm poorer nations by encouraging them to serve as exporters to wealthier nations.

a sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true?  

b europeans take corn to africa. corn becomes an important crop there.

the first two years of american revolution was not very encouraging for the patriots since the british were far superior in sea power, arms and troops.