The acreage of the land is :

(\(\dfrac{28+12}{2}\)) x 8 = 160 (m²)

The acreage to build houses is :

160 x 40% = 64 (m²)

The width is :

60 x \(\dfrac{3}{5}\) = 36 (m)

The area is :

60 x 36 = 2160 (m²)

The perimeter is 

(60 + 36) x 2 = 192 (m)

Apply a formula to calculate the total number , i have :

1 + 2 + 3 + .... + 2015 + 2016 = \(\dfrac{\left[\left(2016-1\right):1+1\right].\left(2016+1\right)}{2}=\dfrac{2016.2017}{2}=2033136\)

3000cm³ = 3 litter

3000cm³ = 30 litter

a) \(4xy^3+\dfrac{1}{3}xy^8+\dfrac{2}{3}xy^3+\left(-\dfrac{1}{3}\right)xy^8\)

\(=\left(4+\dfrac{2}{3}\right)xy^3+\left[\left(-\dfrac{1}{3}\right)+\dfrac{1}{3}\right]xy^8\)

\(=\dfrac{14}{3}xy^3+0\)

\(=\dfrac{14}{3}.\dfrac{2}{3}.\left(-\dfrac{1}{2}\right)^3=-\dfrac{7}{18}\)