To find a baseball pitcher's earned average (era), you can use the formula ei=9r where e represents era, i represents the number of innings pitched, and r represents the number of earned runs allowed. solve the equation for e. what is the pitchers era if he allows 5 earned runs in 18 innings pitched

Ei = 9rE = (9r)/ i
i = 18
r = 5

now we sub
E = (9 * 5) / 18
E = 45/18
E = 2.5the pitchers ERA is 2.5

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm

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