What is the radius of a circle whose equation is x2 + y2 + 8x – 6y + 21 = 0?

units

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.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Pls yall i really need the answer fr fr