Which operation is not closed for polynomials? a) −(x2 + 4x + 5)(8x2 + 3x + 4) b) (7x2 + 2x + 3) + (3x2 − 5x + 4) c) (x2 + 2x + 5) − (x2 − 2x + 9) d) (x3 + 4x − 5)/(x5 − 2x + 2)

An arrow is shot vertically upward at a rate of 180ft/s. use the projectile formula h=−16t2+v0t to determine at what time(s), in seconds, the arrow is at a height of 420ft. round your answer(s) to the nearest tenth of a second.

Which graph corresponds to the function f(x) = x2 + 4x – 1?

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 + 4x + 5 = 0