Final answer:
To match business blog examples to their purposes: announcing job openings is for internal communication, sharing new design updates is for marketing, and encouraging feedback on a product is for building relationships.
Step-by-step explanation:
To match each example of a business blog to its purpose, it is essential to understand the intent behind the content and who the intended audience is. A blog post announcing job openings at a software company is primarily aimed at internal communication, as it is targeting potential applicants within the audience who may be interested in joining the company. A blog post sharing updates on a new design idea for a microwave oven serves the purpose of marketing, as it aims to inform and potentially excite customers about upcoming products. Lastly, a blog post encouraging feedback about a smartphone is focused on building relationships with consumers by engaging them in the development process and valuing their input.