Use the triangle to find the missing angle. Round to the tenths if necessary.

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Solve the equation by completing the square. x^2+2x=17

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?