Find the square.(5x + 12y)2
A. 25x2 + 120xy + 144y2
B. 25x2 + 144y2
C. 5x2 + 120xy + 144y2
D. 5x2 + 144y2
Answer: A
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Estimate the magnitude of the error involved in using the sum of the first four terms to approximate the sum of the entire series.
A. 
B. 3.81 × 10-6
C. 3.05 × 10-5
D. 2.44 × 10-4
Find the solution to the system of equations. Round the answer to five decimal places.x -2y - 4z = -12.86296-x + 2y + z = 5.600413x +y - z = 4.89717
A. x = 0.61634, y = 2.60851, z = 2.42085 B. x = 1.63664, y = 2.4081, z = 2.42085 C. x = 0.61634, y = 2.4081, z = 2.11065 D. x = 1.63664, y = 2.60851, z = 2.11065
Write the given terms as like radicals, if possible. If any variables exist, assume that they are positive.
, 
A. 25
, xy
B. 25
, xy
C. 5
, xy
D. Not possible
Use a proportion to solve the problem.In baseball, the average number of earned runs given up by a pitcher in 9 innings is the pitcher's earned run average, ERA. For example, if a player gave up 90 earned runs in 250 innings during one year, his ERA is found by solving the proportion 
Find the ERA for a player who, in one year, gave up 83 earned runs in 229
innings. Round your answer to the nearest hundredth.
A. 2.76 B. 9.22 C. 3.26 D. 24.87