Help! please explain using trigonometry sines; cos tan sin!!! it’s due right now! please help

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6

Zack and tia played chess for 50 min they put the chessboard away at 11: 20 when did they start