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Stock Images and Videos is a library of millions of high-quality stock images, design elements, videos, and audio files, available via free or premium subscriptions. [29] Templates and Mockups offers customizable templates and mockups for branding, presentations, and product showcases. [30]
A back-of-the-envelope calculation is a rough calculation, typically jotted down on any available scrap of paper such as an envelope. It is more than a guess but less than an accurate calculation or mathematical proof. The defining characteristic of back-of-the-envelope calculations is the use of simplified assumptions.