Question

Larry is putting a row of rocks around his rectangular pool. Which descriptive model will tell him how many rocks he needs?

[2(pool length) + 2(pool width)] times the width of the rocks

(pool length times pool width) times the width of the rocks

(pool length times pool width) divided by the width of the rocks

[2(pool length) + 2(pool width)] divided by the width of the rocks

Answer 1

P = [2( l)+2(w)] / width of the rock

Explanation:

row of rocks around his rectangular pool, this tells us we are finding the perimeter

The perimeter of a rectangle is given by

P = 2( l+w)

P = 2( l)+2(w)

But we know that the length takes into account the width of the rock so divide each side by the width of the rock

P = [2( l)+2(w)] / width of the rock