Solve the problem.2 + 9i is a solution of a quadratic equation with real coefficients. Find the other solution.

A. 2 + 9i
B. -2 + 9i
C. 2 - 9i
D. -2 - 9i


Answer: C

Mathematics

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Use scientific notation to solve the problem.If you could generate energy by fusing the hydrogen in ordinary tap water, how much water would you need to meet the energy needs of the United States for 56 years? Assume that the energy released by fusion of hydrogen in one liter of water is 7 × 1013 joules and that the U.S. annual energy consumption is 1 × 1020 joules. Give your answer in scientific notation.

A. 1.4 × 107 liters B. 8 × 101.5 liters C. 8 × 107 liters D. 8 × 10-7 liters

Mathematics

Provide an appropriate response.Using the example of 9 ÷ 3 × 6, explain why the order of operations is important.

What will be an ideal response?

Mathematics

Solve the problem. Use 3.14 for ?. Round to the nearest tenth.The width of a piece of paper is 8.5 in., the length is 11 in., and the thickness is 0.0038 inches. There are 2600 sheets sitting in a cabinet by the copy machine. What is the volume occupied by the paper.

A. 1482.0 in3 B. 9.2 in3 C. 192.7 in3 D. 923.8 in3

Mathematics

Write the series using summation notation.1 +  +  +  +  

A.
B. )
C. )
D. )

Mathematics