Why calculate the variance covariance matrix for a portfolio

Allan is ordering a set of rational numbers that includes positive values, negative values, fractions, and decimal numbers. How can he order them?

If a firm produces nothing which of the following costs will be zero?

The school drama club sponsored a quessing game at a fair. they put some blue and green marbles in a box. people had to quess how many of each were in the box given two glues. 1. there were 60 marbles total in the box. 2.

Substiute y=3x-15 4x+2y=22

What is the recursive rule for the sequence? - 22.7, - 18.4, - 14.1, - 9.8, - 5.5, ... an=an+1+4.3, where a1=-22.7 an=an-1+4.3, where a1=-22.7 an=an-1-4.3, where a1=-22.7 an=an+1-4.3, where a1=-22.7?

What is the volume of a sphere if its r=21m?

Joe and his parents are going on vacation. On the first day they travel 250 miles. On the second day they travel 300 miles. The total miles they must travel is 1000.

Find x when y=3 in the literal equation 3x+6y=24

The sequence below is arithmetic {1,8,27,64}

Angles α and b are the two acute angles in a right triangle. Use the relationship between sine and cosine to find the value of b if b < α. sin (x 2 + 2x) = cos (2x + 3x 2)