Substitution means putting numbers in place of letters to calculate the value of an expression. An expression can be a combination of numbers, letters and operators, grouped together.

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Substitution means putting numbers in place ... 8^2\) means \(-8 \times -8\), which is +64 using sign rules (two signs that are the same make a positive). \(2 + 64 = 66\). (The addition part ...

Kuiper also suggests cleaning the exterior of these products on a weekly basis, if not more often. “The handles of tea ...

Mexico wants to reduce its dependence on imports from China and is asking some of the world’s biggest manufacturers and tech ...

Read on to learn how to use DuPont analysis to break apart ROE and gain a much better understanding of where movements in ROE are coming from. DuPont analysis is a framework for analyzing ...

Simply click inside these boxes to enter your text. While it’s good to get in the habit of using title slides like these to begin future presentations, you’ll also need to know how to insert ...

It isn’t enough to have great new devices, apps, and games — you also have to know how to use them. Here at The Verge, we offer step-by-step how-tos for experienced and new users who are ...

The most common way to use essential oils is to inhale them, both for their amazing scent and their therapeutic properties. But they can also be used in diffusers and humidifiers, as well as ...

In this guide, we show you how to use WhatsApp for beginners and answer some common questions like whether the platform is safe and encrypted. To use WhatsApp on your iOS or Android phone ...

厉基巍，现任美团研究院副院长。清华大学建筑学院学士、城乡规划专业博士、城市经济专业博士后。先后就职于政府机构、城乡规划院、房地产企业。2019年进入美团研究院，长期从事生活服务、居民消费、灵活就业、数字经济、平台经济等相关领域的研究。