f1

f2

f3

b = 0.963 (slider from 0.9 to 1, step 0.001)
f(x) = (10.5 * 1 / (1 + (0.72 * b^(x))))
a: f(22)
f1(x) = f'(x)
c: f1(0)
f2(x) = f(x) / 100
f3(x) = 0.1 - f2(x)
d = true
e = true
g = true