The correct way to start a sentence with a number is to spell it out...
For example... 'Three people were injured' is correct while '3 people were injured' is not.
Yes. 'Thus' is another word for 'therefore'. Thus the sentence you start of with 'thus' should be an explanatory sentence.
You did a proper job of it.
you all should get the xbox one.
It may depend on how you wish to construct your sentence. The delay of the start or the start has been delayed.
No, you should not. You should only capitalize a word when it is at the start of a sentence or when it is a proper noun.
If you want. You shouldn't, however, at the start of a sentence.
At the start of a sentence or the beginning of a new sentence
It would probably be most appropriate to spell out the number. Example: Three hundred years later...
The word "police" is only capitalized at the start of a sentence, or an exclamation ("Police!").
You can.
Yes, "Hiking" should start with a capital letter in a sentence because it is a proper noun.
Yes. 'Thus' is another word for 'therefore'. Thus the sentence you start of with 'thus' should be an explanatory sentence.
Yes it should.
It should start with a topic sentence.
"In conclusion"
no
You start a sentence with whatever word you need to start it with. A sentence can start with "A" if it needs to. A sentence just needs to make sense.