Concepts in complex numbers

If Z=2+j7, what is the magnitude of z?

• 9.45
• 7.28
• 3.14
• 5.67

z₁ = 2 and z₂ = i. What is the value of |z₁+z₂|?

• √2

• √3

• 2

• √5

What is the argument of the complex number (1 + √3i)?

• 3π/2

• π/4

• π/3

• 2π/3

The magnitude (modulus) of the complex number 6-j8 is:

• 14
• 5
• 2
• 10

What is the distance from point A to (0,0) in the complex graph.

• $\sqrt{34}$

• $\sqrt{8}$

• $\sqrt{2}$

• $\sqrt{-2}$

The argument of complex number  $-i\ =$  

•  $0$  

•  $\frac{\pi}{2}$  

•  $\pi$  

•  $\frac{-\pi}{2}$  

For z =  $1\ +\ \sqrt{3}i$  , what is the argument? 

Choose all that apply.  Find $\left|6+8i\right|$ 

•  $\sqrt{\left(6\right)^2-\left(8i\right)^2}$  

•  $\sqrt{\left(6\right)^2+\left(8\right)^2}$  

• 10

• 10i

Argument of complex number   $-1\ -\ i\ =$  

•  $\frac{\pi}{4}$  

•  $\frac{-\pi}{4}$  

•  $\frac{3\pi}{4}$  

•  $\frac{-3\pi}{4}$  

Find the argument, $\theta\$  for  $z=-1-i$  

•  $-2.3562$  

•  $2.3562$  

•  $0.7854$  

•  $-0.7854$