A function, f(x), has a slope of 2 and contains the point (6,4). Which of the following represents the interval on which the output of the function is positive?

1. f(x) is positive when x >0
2. f(x) is postive when x > 4
3. f(x) is positive when x2 -8
4. f(x) is positive when x is all real numbers

Please help me

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?