Solve the system of equations graphically using a graphing calculator. Find all values to the nearest tenth.x2 - 3y2 = 2x - 2y = -5
A. No solution
B. x = 32.5, y = 18.8; x = -2.5, y = 1.2
C. x = 32.5, y = 18.8; x = -10.4, y = -2.7
D. x = 32.5, y = 18.8
Answer: B
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A. 40 B. 64 C. 20 D. 400
Find the standard deviation s for the given data. Round your answer to one more decimal place than the original data.A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the standard deviation. 
A. 7,673.1 B. 7,892.3 C. 8,111.5 D. 7,307.7
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Solve the equation. If the solutions involve square roots, give both the exact solutions and the approximate solutions to three decimal places.4k2 - 19k - 5 = 0
A. - 
, 5
B. -4, 5
C. - 
, 4
D. 
, - 