Decide whether the following is an expression or an equation. If it is an expression, simplify it. If it is an equation, solve it.x2 - 4 = 0
A. Equation; -2, 2
B. Expression; (x - 2)2
C. Expression; (x + 2)2
D. Equation; 2
Answer: A
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Express the following in interval notation.
A. (-?, -4) B. (-?, -4] C. (-4, ?) D. [-4, ?)
Graph.(x + 1)2 - 9(y - 1)2 = 9
A. 
B. 
C. 
D. 
Convert the angle from radians to degrees.
A. 30?° B. 1° C. 6° D. 30°
Solve the problem.In baseball, a pitcher's earned-run average (the average number of runs given up every 9 innings, or 1 game) is given by E = 9 (n/i) , where n is the number of earned runs allowed and i is the number of innings pitched. Suppose we fix the number of earned runs allowed at 6 and let i vary.
Complete the following table, rounding to two decimal places. 
Find 
style="vertical-align: -25.0px;" />E(i).
On the basis of Parts (a) and (b), determine a pitcher's earned-run average if 
were allowed and there were 0 outs.
A. 
?; ?
B. 
162; 324
C. 
-?; -?
D. 
? ; 0