Explain why the group of ordered pairs below is a function or not a function.
(2,5) - (3,6) - (5,7) - (8,6) - (3,5) - (7,4)

it is not a function because there is a domain that has two different ranges

Step-by-step explanation:

so (3,6) and (3,5) have the same domain but different ranges. this means that is cannot be a function. i have a way to remember this. my teacher once told me that the domain is like the ingredients in a recipe. you can use different ingredients and get the same outcome(like a cake) but cannot use the same ingredients and get a different outcome. so you can have different domains with the same range, but never the same domain and different ranges

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.

is there a picture

step-by-step explanation: