Methane is a greenhouse gas that lets sunlight into the atmosphere but blocks heat from escaping Earth's atmosphere. In the table, f(x) models the predicted methane emissions in millions of tons produced by developed countries. The function g(x) models the same emissions for developing countries.

(a) Make a table for a function h that models the total predicted methane emissions for developed and developing countries. 

(b) Write an equation that relates f(x), g(x), and h(x).

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x 1990 2000 2010 2020 2030 28 29 30 31 7.5 10 12.5 15 f(x) 27 g(x) 5