You have to find ABC and I'm not sure how to any help is appreciated ​

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

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.