Rewrite all the expressions without using zero negative exponent then simplify (-2 m2 n-5)-2 m-5 n2

What is 2x+10y-6=12? formula : y=mx+b

What is polynomials? give example atleast 1

5.you were given the following data for the summit marketing co. as of january 31, 201a: salesp127 500purchases (merchandise)57 000freight in5 000taxes and licenses900communication expense300heat, light, and water1 240store supplies expense1 180office supplies expense730miscellaneous expense2090chapter 3 - buying and selling 15​