Simplify
square root negative 16

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

What is the volume of the sphere shown below with a radius of 3?

Secant be and cf intersect at point d inside a what is the measure of cde