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.
Nightmares occur from dream sleep (REM sleep). Your child may wake up from the nightmare and, depending on their age, may be able to remember and describe the bad dream to you. Both night terrors and nightmares in children are described in more detail below, along with advice about what you should do.ightmares are common in children aged three to six years. Most children grow out of them. Nightmares usually occur later in the night and cause strong feelings of terror, fear, distress or anxiety. Your child may wake up and be able to remember and describe the dream to you.