Which of the following statements best describes the relationship of a relation and a function? select all that apply. a relation is always a function. a function is always a relation. a function is a relation, if and only if, the x-values do not repeat in a given set. a relation is a function, if and only if, the x- values do not repeat in a given set. a function is never a relation. a relation is never a function.

The statement that best describes the relationship of a relation and a function is:

Relation--

Let A and B be two set then a relation from set A to set B is the collection of the ordered pairs of the type:

(a,b) where  a belongs to A and b belongs to B.

Function--

A function from set A to set B is the mapping in which each element of set A is mapped to a single element of B.

Hence, we may say that a function is always a relation but a relation need not always be a function.

For a relation being a function we may assure that each element must have a single image.

i.e. there may not exist any ordered pair of type:

(x,y) and (x,y')

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

answer: two angles are called supplementary if they add up to 180°. example: the two angles (140° and 40°) are supplementary because they add up to 180°.

step-by-step explanation: