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.
In a process like photosynthesis which is affected by more than one factor, its rate is limited by the factor which is closest to its minimum value. So at any point in time if one of the three factors is in low supply, this factor will be the limiting factor.