If a quadratic function is 0 for any value of the variable, then that value is a solution.

A random variable is a function that assigns unique numerical values to all possible outcomes of a random experiment.

A real valued function defined on a sample space of an experiment is also called random variable.

It is not necessary to to declare variables inside the function in C. If you declare a variable inside a function, the variable becomes local for the function and another variable of same name can be declared in any other function, but you can not use the variable declared in other function. When you declare any variable outside the function body then the variable becomes global and can be used in any function of the program.

Note: errno is an example for a variable declared outside any function.

No.

local variable