18(−8c+16)−13(6+3c) i need with this its confusing

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

Can someone me do math because i am having a breakdown rn because i don’t get it

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.