Write the number as a product of a real number and i. Simplify the radical expression.
A. -4i
B. 4
C. 4i
D. -4
Answer: C
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Solve.If an earthquake measured 6.3 on the Richter scale, what was the intensity of the earthquake in terms of I0? The magnitude on the Richter scale of an earthquake of intensity I is 
A. 199,526? I0 B. 1,584,893? I0 C. 1,995,262 ? I0 D. 544? I0
Solve the problem.The shape and density of a thin shell are indicated below. Find the coordinates of the center of mass.Shell: portion of the sphere x2 + y2 + z2 = 16 that lies in the first octantDensity: constant
A. 
B. 
C. 
D. 
Write the decimal as a percent.0.2
A. 0.02% B. 0.2% C. 200% D. 20%
Provide an appropriate response.How many different sequences of 4 digits are possible if the first digit must be 3, 4, or 5 and if the sequence may not end in 000? Repetition of digits is allowed.
A. 1512 B. 5000 C. 2999 D. 2000 E. 2997