4324.sagews

y(a,x,b) = a*(x^b)

# The number of opportunities to practice a skill: x
# 0 <= x < 100
# The error rate on the first trial [intrinsic difficulty of a skill]
a = 0.3
# The learning rate [ease of learning of a skill]
b = -0.5

plot(y(a,x,b), (x,1,10))