Contestants on a game show spin a wheel in order to receive prizes. The show's producers wish to include a feature that shows the audience how fast the wheel is being spun each time. Which type of quantity will best indicate how fast the contestants are spinning the wheel?

Step-by-step explanation:

1). By using quadratic regression calculator,

   Equation of the regression line is,

   y = -0.4931x² + 23.3798x + 996.0289

   Here, y = soil density

   And variable x = depth

2). For soil density of a sample at depth,

   y = -0.4931(20)² + 23.379(20) + 996.0289

   y = -197.24 + 467.58 + 996.0289

   y = 1266.3689

   y ≈ 1266 mg per cm³