Find all solutions of the equation in the complex number system.x4 - 16 = 0
A. {-2, 2, 2i, -2i}
B. {2i, -2i}
C. {2, 2i}
D. {-2, 2}
Answer: A
Mathematics
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Use a calculator to perform the operation. Express your answer in scientific notation.0.0000725(0.00473)(2,450,000,000)
A. 8.40 × 10-14 B. 8.40 C. 8.40 × 102 D. 8.40 × 107
Mathematics
Provide an appropriate response.Write as an imaginary number: 
A. -10i B. -50i C. 100i D. 10i
Mathematics
Solve.A doctor wants a patient to receive 4.8 L of a normal saline solution in a 
period. How many milliliters per hour must be administered?
A. 4800 mL B. 200 mL C. 115.2 mL D. 0.2 mL
Mathematics
Solve the problem.Martha can rake the leaves in her yard in 2 hours. Her younger brother can do the job in 6 hours. How long will it take them to do the job if they work together?
A. 
hr
B. 
hr
C. 6 hr
D. 3 hr
Mathematics