With these ! need to do them asap

will give branliest answer to the most informative answer which will give extra points! no answers that do not answer the question

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

Im gonna fail 7th grade selective breeding 1. creates offspring which are genetically identical to the parent 2. is the process of breeding only organisms with desirable traits 3. involves the removal of the nucleus of a cell 4. combines traits from organisms of different species