Write the expression as a pure imaginary number.
A. ±13
B. 13i
C. -13i
D. -
i
Answer: B
Mathematics
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Find an exponential model for the following data set. Round your answer to two decimal places. t 0 1 2 3 y 3.02 5.13 8.72 14.82?
A. ?
B. ?
C. ?
D. ?
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Parametrize the surface S.S is the portion of the cone 
+ 
= 
that lies between z = 2 and z = 5.
What will be an ideal response?
Mathematics
The scores on a 30-point multiple-choice exam are given in the following frequency table:
The first quartile on the exam is
A. 25. B. 24.5. C. 24. D. 25.5. E. none of these
Mathematics
Determine whether the expression represents a number that is positive, negative, or zero.(-3)-3
A. Positive B. Zero C. Negative
Mathematics