The sum of exterior angle of an polygon is what?

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Zoe placed colored blocks on a scale in science class. each block weighed 0.8 ounces. the total weight of all the colored blocks was 12.8 ounces. how many blocks did zoe place on the scale? write and solve an equation to find the answer.

For how answer my question this will be the last question can you answer in math subject

Which of the following points is collinear with (-2,1) and (0,3)