The graph of a linear function is shown. A coordinate plane with a straight line passing through (negative 4, 2), (0, 0), and (4, negative 2). Which word describes the slope of the line? positive negative zero undefined

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

It says factor each expression 49x-28?

I'm confused on this could anyone me and show me what i need to do to solve it.