Question 850668
Let x = the number of children
Let y = the total trees
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Each child planted 7 trees (5 in the park & 2 at home)
7x = y
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For question 1, if there are 7 children * 7 plants, 7*7 = 49
For question 2, the value is X.  (If this is Common Core Crabbbb, then you're probably supposed to answer with "values" such as 'forward-thinking' to plant trees for the future, 'environmental conservation' by planting trees.  I hope they got a permit to plant in the park, and they know which sort of trees to plant at home so they don't mess up their neighbor's house foundation or pipes.)
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What's wrong with Common Core: http://www.pittsreport.com/2013/06/what-is-wrong-with-common-core-math/