27. Use the table to estimate fo f(x) dx 0 3 6 9 12 15 f (a) 50 48 44 36 24 8 28. Use the figure below to find the values of (a) Sof(x) dx (b) S3 f (x) dac (c) S2 f(x) da (d) S5 f(x)dx - N f ( x) X 2 4 6 8 103 30. The table gives annual US emissions, H (t), of \"super greenhouse gases,' in millions of metric tons of carbon-dioxide equivalent. Let t be in years since 2000. (a) What are the units and meaning of f214 H (t)dt? (b) Estimate [214 H(t)dt. lYear 2002 2004 2000 2008 2010 2012 2014 |H(t) 142.3 139.6 144.1 157.5 164.0 170.1 180.1