### Home > CALC > Chapter 11 > Lesson 11.1.3 > Problem 11-34

11-34.

A = –1**i** + 3**j**

Solve tan(*θ*) = 3/1. This will solve for the angle in the slope triangle for A.

Recall that the standard angle is measured from the positive *x*-axis.

A + B = 〈 –1, 3〉 + 〈 4, 3〉 = ?

The double bars mean "the magnitude of". To calculate the magnitude of vector B, use the Pythagorean Theorem.