Mathematics, 23.11.2020 03:10, ddddre3909

Trees in urban areas keep air fresh by absorbing carbon dioxide. A city has $2400 to spend on planting spruce and maple trees. The land available for planting is 45,000 square feet. Spruce trees cost $20 to plant and require 300 square feet of space. Maple trees cost $30 to plant and require 900 square feet of space.

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Trees in urban areas keep air fresh by absorbing carbon dioxide. A city has $2400 to spend on planti...