Logistic growth exercises

The simplest logistic function:
  N(t) = 1 / (1 + e^-t)
L = C = k = 1

Graph it.  The shape of this curve is called:_____
What is the value of the function when 
t = 0
t = 1
t = 2
t = 3
t = 4
As x gets large, what does the function value approach (horizontal asymptote)?
t = -1
t = -2
t = -3
t = -4
As x gets small (negative), what does the function value approach (horizontal asymptote)?

Use WolframAlpha to solve for t:
N(t)=.5
N(t)=.6
N(t)=.9
N(t)=.2

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  N(t) = 100 / (1 + 50e^-.5t)
L = 100
C = 50
k = .5

Graph it.

What is the value of the function when 
t = 0
t = 5
t = 10
t = 15
t = 20
As x gets large, what does the function value approach (horizontal asymptote)?

Use WolframAlpha to solve for t:  (parenthesize the exponent)
N(t)=10
N(t)=25
N(t)=50
N(t)=75