What french mathematician built and sold the first gear-driven mechanical machine that did addition and subtraction?

a.

congress passed laws allowing for free passage between states.

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.

d)to gain support for the independence movement.

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the main concern with the first draft of the articles of confederation was too much power in the state governments.