PayScale.com indicated that the middle-half salary range for tutors employed by major tutoring providers in May 2011 was between $10.10 and $17.50 per hour. These services screen and train tutors for you, and may even offer you a money back guarantee if your child's grades don't improve.
Definition of 'limiting factor'. limiting factor in American. an environmental factor that limits the growth or activities of an organism or that restricts the size of a population or its geographical range.
Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size. With a positive relationship, these limiting factors increase with the size of the population and limit growth as population size increases. With a negative relationship, population growth is limited at low densities and becomes less limited as it grows.