Write the expression as a pure imaginary number.
A. 
i
B. -8i
C. ±8
D. 8i
Answer: D
Mathematics
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Use the formula for Sn to find the sum of the first five terms of the geometric sequence. Round to the nearest hundredth, if necessary.3, 9, 27, 81, . . .
A. 373 B. 362 C. 363 D. 360
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Evaluate the exponential form. -53
A. -15,625 B. 125 C. 625 D. -125
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Add or subtract as indicated.(-2x2y2 - 8y4) + (11x2y2 + 12y4)
A. -22x4y4 - 96y8 B. 9x2y2 + 4y4 C. 9x2y2 - 4y4 D. 9x4y4 + 4y8
Mathematics
Multiply by following the procedure for multiplying decimals.0.09 × 0.9
A. 8.1 B. 0.81 C. 0.081 D. 0.0081
Mathematics