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Mathematics, 03.08.2019 12:00 camiee13dvivvj

Trees in urban areas keep air fresh by absorbing carbon dioxide. a city has $2100 to spend on planting spruce and maple trees. the land available for planting is 45,000 square feet. spruce trees cost $30 to plant and require 600 square feet of space. maple trees cost $40 to plant and require 900 square feet of space. spruce trees absorb 650 lb/yr of carbon dioxide and maple trees absorb 300 lb/yr of carbon dioxide. how many of each tree should the city plant to maximize carbon dioxide absorption?

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