Subtract.7.923 - (-0.39)
A. 7.533
B. 8.413
C. 3.090
D. 8.313
Answer: D
Mathematics
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Find the derivative.f(x) = (2x2 - 9)5
A. 20(2x2 - 9)4 B. 20x(2x2 - 9)4 C. 5(2x2 - 9)4 D. (20x - 9)(2x2 - 9)4
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Solve the problem. Round amounts to the nearest cent and percents to the nearest tenth of a percent.The markup on an external hard drive is $15. Find the cost of the hard drive if the markup is 20% of the cost.
A. $18.00 B. $75.00 C. $12.50 D. $3.00
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Use substitution to determine whether the system of linear equations has no solutions, one solution, or infinitely many solutions.x + 2y = 0y = - 
x
A. Infinitely many B. One C. No solutions
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Find the largest open intervals where the function is concave upward.f(x) = 
(exact values)
A. (-?, -1), (-1, ?)
B. None
C. (-?, -1)
D. (
, ?)
Mathematics