Roughly what percent of American families lived below the poverty line in 2010?

A futures contract is

A) an agreement that specifies the delivery of a commodity or financial instrument at an agreed-upon future date at a currently agreed-upon price. B) an agreement that specifies the delivery of a commodity or financial instrument at an agreed-upon future date, with the price to be negotiated at the time of delivery. C) an agreement that specifies the delivery of a commodity or financial instrument at a currently agreed-upon price, with date of delivery to be negotiated subsequently. D) an agreement that specifies the delivery of a commodity or financial instrument, with the price and date of delivery to be negotiated subsequently.

What is personal income tax? On which principle does the federal government levy this tax?