Math  Limits
posted by Anonymous .
Find the derivative of f(x) = 1000 / (0.1x + 1) where 10 <= x <= 70

write it as
y = 1000(.1x + 1)^1
dy/dx = 1000(.1x + 1)^2 (.1)
= 100/(.1x + 1)^2
The function and its derivative are both defined for your given domain.