Final answer:
To provide enough oxygen for the families in the community in 2019, approximately 33 trees are needed.
Step-by-step explanation:
To determine the number of trees needed to provide enough oxygen for the families in the community, we need to calculate the oxygen produced by each tree and then find the total oxygen required for all the families in 2019.
One tree produces nearly 260 pounds of oxygen each year. Since two mature trees can provide enough oxygen for a family of four, each family requires half the oxygen produced by two trees, which is 260/2 = 130 pounds of oxygen.
To find the total oxygen required for all 65 families in the community, we multiply the oxygen required per family (130 pounds) by the number of families (65), which gives us 130 * 65 = 8,450 pounds of oxygen.
Since the question asks for the number of trees, we divide the total oxygen required (8,450 pounds) by the oxygen produced by one tree (260 pounds) to find the number of trees needed, which is 8,450/260 = 32.5 trees. However, since we can't have half a tree, we need to round up, so the answer is approximately 33 trees. Therefore, the correct answer is option a) 130 trees.