1. detrás
2. near
3. encima
4. lejos
5. en
6. encima
7. enfrente
8. between
9. izquierda
10. entre

The square (²) can be distributed to each factor inside those parentheses.
3² = 3 × 3 = 9
as for the x^-3, we want to multiply our exponents together, leaving x^-6.

Note that since multiplication is commutative/associative, we can multiply these together in whatever order to simplify.
The x on the right can be rewritten as x¹. Multiply that and x^-6 together to get x^-5. (we just add the exponents)
As for the 9 and -2, multiply those together to get -18.
Now we have

.
Lastly, if you don't want a negative exponent in your answer:
It can be flipped to the bottom because of this property:

This leaves us with
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Explanation:
The ending tells the audience who you are talking about, and also the tense you are talking in. Without the ending, no one would know who you're talking about (if you didn't say the subject before), and everyone could just assume you are always saying the present tense.
Ex. What they think you said- I'm buying a cake for my brother's birthday.
What you actually said- I bought a cake for my brother's birthday
This interpretation could lead to all sorts of problems, I'll leave what to your imagination, and this goes for many other situations.
Last is the obvious: if you do that in class, you fail your test.