The length of the metal threads at the end of a spark plug is called the
a. ground.
b. insulator.
c. shell.
d. reach.

d. reach

Explanation:

A spark plug is a device for igniting a definite volume of compressed air mixed with fuel. It has majorly three parts, center electrode which is an insulator, the thread reach at the end of the plug and a side metallic electrode. It is used in mechanical devices where combustion is of great importance.

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .