Answer: The required value of the expression at x= 80 is 16.
Step-by-step explanation: We are given to find the value of the following expression when x = 80 :
\(E=x\div 5~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)\)
To ind the value of expression (i) at x = 80, we must substitute the value of x in the expression.
From expression (i), we get
\(E\\\\=x\div 5\\\\=\dfrac{x}{5}\\\\=\dfrac{80}{5}\\\\=16.\)
Thus, the required value of the expression at x= 80 is 16.
