A line is an endless collection of points that follow a straight path. there is no start and finish and there are no curves.
"imaginary" does not describe a line by definition because lines are definite points, not imaginary ones. "endless" does describe a line because, as stated, they have no start or finish. "curved" does not describe a line, because lines follow a straight path. "has no width" describes a line accurately because lines are one dimensional; when we imagine a line, we visualize it by drawing one with a certain width, but in geometry, lines do not have any width. it's just a representation. a line additionally does not "have two endpoints"--that would be a line segment, with a starting point and a finishing point. lines go on forever in both directions, so you wouldn't be able to find endpoints for it.
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a satellite is acted upon by the force of gravity and this force does accelerate it towards the Earth. In the absence of gravity a satellite would move in a straight line path tangent to the Earth. In the absence of any forces whatsoever, an object in motion (such as a satellite) would continue in motion with the same speed and in the same direction. This is the law of inertia. The force of gravity acts upon a high speed satellite to deviate its trajectory from a straight-line inertial path. Indeed, a satellite is accelerating towards the Earth due to the force of gravity.
<span>The global average surface temperature has increased over the 20th century by about 0.6°C.</span>
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I am pretty sure it is true.
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