Matrices and Complex Numbers

What do m, n, p and q equal in this scalar matrix multiplication?

• m=8, n=9, p=-4, q=4

• m=15, n = -45, p=20, q=-5

• m=20, n=-5, p=15, q=-45

• m=-5, n=20, p=-45, q=15

What are the dimensions of this matrix?

• 2 x 3

• 3 x 2

• 6 x 1

• 3 x 3

How many columns are in a 5 x 4 matrix?

• 5

• 4

• 20

• 9

Simplify: i⁷⁹

• i

• 1

• -1

• -i

Simplify:

(2 - 3i)(5 + 4i)

• 22 - 7i

• 22 + 7i

• 22 - 7i²

• 20 - 7i

Find the conjugate of:

5 + 7i

• 5 − 7i

• -5 − 7i

• -5 + 7i

Add

• 11 8

  -4 2

• 3 2

  -6 -6

• 11 8

  -4 -6

• 10 8

  -6 2

Simplify:

(10+ 15i) - (48 - 30i)

• 58 - 45i

• 58 - 15i

• -38 - 15i

• -38 + 45i

Simplify

• 25i

• -5i

• 5i

• 5

In Matrix R (pictured) what number is in the second row, third column?

• 8

• 9.01

• 6

• 1