Multiply mentally.(x - 9x3)2

A. x2 - 18x3 + 81x6
B. x - 18x2 + 81x6
C. x2 - 18x4 + 81x6
D. x2 - 18x6 + 81x9


Answer: C

Mathematics

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A. -24x10 + 5x4 B. -4x5 C. -4x10 - 4x9 D. -24x10 + 20x9

Mathematics

Find the surface area of the circular solid. Unless otherwise specified, use 3.14 for ? and round your answer to the nearest tenth.If the diameter of a sphere is 20 feet, find the surface area of the sphere. Give an exact answer.

A. 1600? square feet B. 800? square feet C. 400? square feet D. 1200? square feet

Mathematics

Solve the equation in the complex number system.8x2 + 1 = 3x

A.
B.
C.
D.

Mathematics