Well not all lines are lines of symmerty, because if you draw a let's say a rectangle on a piece of paper and draw a diagonal line through it, well the two sides don't really lie perfectly on one another!!
its the 3rd answer i think
Answer:
positive number
Step-by-step explanation:
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The equation of a parabola is:

If a>0, then the parabola opens up;
If a<0, then the parabola opens down.
The coordinates of focus are:
The sun is 332608.6957 times bigger than earth, or 3.326086957*10^5 times bigger.