Which is the definition of a ray?

a part of a line that has one endpoint and extends indefinitely in one direction

the set of all points in a plane that are a given distance away from a given point

lines that lie in the same plane and do not intersect

a part of a line that has two endpoints

a part of a line that has one endpoint and extends indefinitely in one direction

Step-by-step explanation:

A ray starts at a given point and goes towards in a particular direction to infinity. The point where the ray starts is called its endpoint. On its way in a particular direction it passes through infinite points.

Therefore, the correct definition of a ray is "a part of a line that has one endpoint and extends indefinitely in one direction"

the answer is A

Step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: