The equation used to predict the annual sorghum yield (in bushels per acre) is

ŷ = 80.1 - 20.2x₁ + 21.2x₂

where x₁ is the number of acres planted (in millions) and x₂ is the number of acres harvested (in millions).

(a) x₁ = 5.5, x₂ = 3.9

(b) x₁ = 8.3, x₂ = 7.3

(c) x₁ = 6.5, x₂ = 5.7

(d) x₁ = 9.4, x₂ = 7.8

Use the multiple regression equation to predict the y-values for the values of the independent variables.