Subtracting 3xy2 from 8xy2 gives the same result as the expression

answers
3xy^2- 8xy2
-7xy^2-2xy^2
7xy^2-2xy^2

Question and answers are in the attached picture. you so much in advance.

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics