Describe an instance where you might use standard rounding. describe an instance where you might use order of magnitude estimation. If you did this on part 2 of the test, plz help me out,( do not delete answer or give me false hope, no links. Because I can’t open them, if you have a link, go in that link and copy and paste your answer) I really need general help here.

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward