How is a pitcher's ERA computed?

Question:and how is a batter's slugging percentage computed?

Answers:

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Earned Run Average [ERA]

(Number of Earned Runs x 9) divided by (Number of Innings Pitched)

So If a guy pitched 5 innings and gave up 5 EARNED runs his ERA would be:
(5x9)/5 = 45/5 = 9.00

pretty simple huh?

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Total earned runs divided by innings pitched times nine.

Total bases on hits (single, double, triple, hr) divided by times at bat

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The pitchers total earned runs given up divided by total innings pitched times 9

example 27 innings, 8 earned runs given up, = 2.66 era.

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