Subtract-2.x2 + 4x – 1 from 6x2 + 3x
Your answer should be a polynomial in standard form.

I'm confused on this could anyone me and show me what i need to do to solve it.

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

Kelli swam upstream for some distance in a hour.she then swam downstream the same river for the same distance in only 6 minutes.if the river flows at 5km/hr, how fast can kelli swim in still water?