The Chen family bought a small business. The equation yˆ=4.2x−12.9 models the business's cash value, in thousands of dollars, x years after they bought the business. Which statement best explains what the y-intercept of the equation means?

After the Chen family bought the business, the business lost $12,900 in 4.2 months.
The business was $12,900 in debt when the Chen family bought it.
The Chen family paid $12,900 for the business.
The business lost $12,900 every year after the Chen family bought it.

Runners run around the school's football field. the cross country coach determines that the width of the field is seventy yards shorter than the length. part a write an expression that represents the perimeter of the football field. let x represent the length of the football field. include parentheses in your expression. next, write an equivalent expression that does not include parentheses. what property or properties did you use to simplify? explain. part b the cross country coach later determines that the length of the football field is 120 yards. all students must run five laps. using your answer from part a, determine the actual number of yards that each athlete must run in the tryouts. in order to make the team, students must complete the laps in 6 minutes. how quickly must they run each lap?