In Exercises 21–38, let u = 2i - 5j, v = -3i + 7j, and w = -i - 6j. Find each specified vector or scalar. u + v

Vector addition involves combining two or more vectors to form a resultant vector. This is done by adding their corresponding components. For example, if vector u has components (2, -5) and vector v has components (-3, 7), their sum is calculated by adding the i-components and the j-components separately, resulting in a new vector.

Vectors can be expressed in component form, typically as a combination of unit vectors i and j in a two-dimensional space. For instance, a vector u = 2i - 5j indicates it has a horizontal component of 2 and a vertical component of -5. Understanding this form is essential for performing operations like addition or subtraction.

The resultant vector is the vector that results from the addition of two or more vectors. It represents the cumulative effect of the individual vectors. In the context of the question, finding u + v will yield a resultant vector that combines the effects of both vectors, providing a new direction and magnitude.