What are the roots of the equation x² + 6x + 13 = 0 in simplest a + bi form? please someone help me bro im so bad at trig

Plz ! what is the volume of this pyramid? with numbers of 30cm 14cm 18cm

An equation where variables are used to represent known values—function notation true or false

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)