A hill that has a 31.7% grade is one that rises 31.7 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such a hill inclined above the horizontal

The grade is also the tangent of the angle above horizontal.

The angle whose tangent is 0.317 is called the "arctangent" of 0.317

It's 17.6 degrees.

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.