The site contains multiple advertisements, including one which appears right above the “calculate” button. If a user is not paying attention, they may be likely to click on the advertisement rather than the “calculate” button. Therefore, these advertisements can cause a confuse to many users. To view solutions, users must click on “show steps” and then click on the arrow next to “step-by-step solution” to see all steps. This could be improved by displaying all solutions after the first click.