Simplify the expression using the imaginary unit i.- 
A. -9i
B. 9
C. 9i
D. -9
Answer: A
Mathematics
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Express the number in scientific notation.870,000
A. 8.7 × 105 B. 8.7 × 104 C. 8.7 × 10-4 D. 8.7 × 10-5
Mathematics
Provide an appropriate response.Use the method of Lagrange multipliers to determine the critical points of f(x, y, z) = x2 - 3y2 - z2 + 6 subject to the constraint 5x - 3y + z = 21.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Solve the problem.In a town whose population is 3000, a disease creates an epidemic. The number of people, N, infected t days after the disease has begun is given by the functionN(t) = 
. Find the number of infected people after 10 days.
A. 2737 people B. 2000 people. C. 142 people D. 1000 people
Mathematics
Add or subtract as indicated. Simplify if necessary.- 
- 
A. 
B. - 
C. 
D. - 
Mathematics