A(n) is a typical, highly representative example of a concept. it is often described as an "average" or an "ideal member."

Prototype

Step-by-step explanation:

Before a product is made, an original model of the product is first formulated. This is called a prototype. It is not simply a part of the design, but a very important part that the process of creating the final product solely depends on it. It is largely described as a highly representative example of a concept or product.

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72

i believe that the answer is

b. y-1=-2(x-4)

hope this !