It is the start of a question. A statement would then follow as part of the question. It is asking you to read that statement and carry out the instructions in the first part of the question.
Without the statement it is not possible to answer the question.
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A numerical expression is an expression that uses number. For example, if a teacher told you to write four plus six subract two , you would simply write it in number form. 4+6-2.
That probably means that you describe something in words.
(5 × 7) ÷ 5 = 7
I suppose you mean 1099. If you write it out, you get a 1, followed by 99 zeroes.
The mean write the number as an expression of its prime factors. The prime factors of 210 are 2, 3, 5 and 7. 2 x 3 x 5 x 7 is the prime factorization of 210.