Any expression, like "you're pulling my leg", or "there's more than one way to skin a cat." It's really hard to explain these things to people who haven't grown up with these expressions. Also, words like "the", "and", and others are super important in everyday life, but you really can't describe. Undefined terms are also important in geometry. A point is an undefined term, and so is a line. But without these two things, geometry would be impossible.
Hopefully this helps! Let me know if you have any more questions.
Answer: Look up your exact question
Step-by-step explanation: The question you've asked has also been asked by another person on brainly, you could look at their answer. Link: brainly.com/question/11191408
Is it supposed to be equal to something, maybe "0"? You wouldn't be able to solve this without that.
Answer:
see below
Step-by-step explanation:
Hi!
![\frac{1}{21-20} \left[\begin{array}{ccc}-3&10&\\2&-7&\end{array}\right]](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B21-20%7D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-3%2610%26%5C%5C2%26-7%26%5Cend%7Barray%7D%5Cright%5D)
(Determinant is 1 in this case)
Hence the inverse is:
![\left[\begin{array}{ccc}-3&10\\2&-7&\\\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-3%2610%5C%5C2%26-7%26%5C%5C%5Cend%7Barray%7D%5Cright%5D)