The regression model F(w) = 48-0.008w relates the fuel economy, F(w), in miles per gallon of a car that has a weight of w pounds. According to the
model, a car with a fuel economy of 28 miles per gallon will weigh

Step-by-step explanation:

From the question we are told that:

Length of Bed

Width of sidewalk

Area of the bed and sidewalk

Generally the equation for Area of the bed and sidewalk is mathematically given by

Therefore

Solving the Quadratic Equation

  (Using only positive root)

Generally the Length L is mathematically given by