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A baseball pitcher's earned run average (ERA) is A(e,i) = 9e/i, where e is the number of earned runs given up by the pitcher and i is the number of innings pitched. Good pitchers have low EF Assume that e 2 0 and i > 0 are real numbers. a. During his best season, a certain pitcher pitched a total of 205 innings and gave up just 22 earned runs. What was his ERA? b. Determine the ERA of a relief pitcher who gives up 2 earned runs in one-third of an inning. c. Graph the level curve A(e,i) = 3, and describe the relationship between e and i in this case. a. The pitcher's ERA for the season was . (Round to two decimal places as needed.) b. The relief pitcher's ERA was . (Round to two decimal places as needed.) c. Graph the level curve A(e,i) = 3. Choose the correct graph below. O D. OC A OB 10- Q 10 Q 10 HHHHHHHH Q Describe the relationship between e and i in this case. The relationship between e and i is relationship. question 1 of 6 This This K Find the domain of the following function. f(x,y) = sin -1 (y- 3x2) Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. O A. {(x,y): - 15 51} O B. {(x,y): o'} garro points, possible O E. R2 This question: 1 point(s) possible Match the graph of the function z = 2- (x2 +y?) (x2 -y?) to the system of the level curves. K Find the domain of the following function. K f(x.y) =4xy -9x +7y Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. {(x,y): x and y* )(Use a comma to separate answers as needed.) O B. ((x.y): >0) Which of the following level curves matches the given surface graph? O c. {(x.y): x * y) O D. {(x.y):