Solve the problem.An influenza epidemic spreads at a rate proportional to the product of the number of people infected and the number not yet infected. Assume that 80 are infected at the beginning of the epidemic in a community of 10,000 people and 300 are infected 10 days later. Write an equation for the number of people infected, y, after t days.
A. y = 
B. y = 
C. y = 
D. y = 
Answer: C
Mathematics
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Find the gradient field of the function.f(x, y, z) = z sin (x + y + z)
A. ?f = -cos xi - cos yj + (sin z - z cos z)k B. ?f = z cos(x + y + z)i + z cos(x + y +z)j + (sin(x + y + z) + zcos(x + y + z))k C. ?f = -z cos(x + y + z)i - z cos(x + y +z)j + (sin(x + y + z) - zcos(x + y + z))k D. ?f = cos xi + cos yj + (sin z + z cos z)k
Mathematics
Graph the ellipse. 5x2 + 2y2 + 40x - 16y + 102 = 0
A. 
B. 
C. 
D. 
Mathematics
Subtract.5.279 - 4.949
A. 0.43 B. 9.228 C. 0.330 D. 10.228
Mathematics
Find the base. Round to the nearest hundredth unless otherwise indicated.70% of what number of highways is 77 highways?
A. 53.9 B. 11 C. 1100 D. 110
Mathematics