Of course you can use the quotient rule, but it is usually not the easiest method. If we do use it here, we get $${d\over dx}{10\over x^2}={x^2\cdot 0-10\cdot 2x\over x^4}= {-20\over x^3},$$ since the derivative of 10 is 0.
1 Young children can't tell the difference between fantasy and reality. 2  Your preschooler's rich imagination is a big part of his normal development, but that means it is usually hard for him to tell the difference between what's real and what's imaginary.
This is not to say religion is fantasy (thatâs a separate debate), but simply that the religious elements cannot be proven scientifically. For some people, the lines between soft science fiction and science fantasy are blurry however. It is commonly argued that the definition is, in fact, subjective.