(2x+1)(x^3+2x^2-3) I need this answer

Which term describes the point where the perpendicular bisectors of the three sides of a triangle intersect?

Afootball is passed through the air and caught at ground level for a touchdown. the height of the ball (h) is given by h= -d² + 12d + 6, where d is the distance in feet the ball travels horizontally. how far from the player passing the ball will the ball be caught? 40 points! will mark brainliest!

Solve for x. x/5+ 1 = 7 x = 5 5/6 x = 30 x = 35 x = 40