How can you find out the mass of a marble

I’m really confused and need to learn this

Determine the standard form of the equation of the line that passes through (-2,0) and (8,-5)

Prove the converse of the pythagorean theorem using similar triangles. the converse of the pythagorean theorem states that when the sum of the squares of the lengths of the legs of the triangle equals the squares length of the hypotenuse, the triangle is a right triangle. be sure to create and name the appropriate geometric figures.