Solve the equation by using the square root property. Express any complex numbers using i notation.x2 = 36
A. x = 18
B. x = 6
C. x = ± 7
D. x = ± 6
Answer: D
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Perform the operation and write the result in the standard form.8i(9 - 3i)
A. 24 + 72i B. - 72i - 24i2 C. 72i - 24 D. 72i + 24i2
Find the sum, sn, of the sequence.a1 = -8, d = -9; find s6
A. -51 B. 183 C. - 183 D. -102
Find the midpoint of the line segment whose endpoints are given.(4, -8), (0, 4)
A. 
B. (4, -12)
C. 
D. (4, -4)
Solve the problem. Express the answer in scientific notation to two decimals unless requested otherwise.Assume that the volume of the earth is 5 × 1014 cubic meters and the volume of a bacterium is 
cubic meters. If the earth could be filled with bacteria, how many would it contain?
A. 2.0 × 1030 bacteria B. 5.0 × 10-31 bacteria C. 5.0 × 1031 bacteria D. 2.0 × 10-30 bacteria