Question

there are several unknown____that we need to look into on spreadsheet 1)variables 2)sentiments 3)salutations
4)illusions​

Answer 1

The option 1 is correct i.e. There are several unknown variables that we need to look in spreadsheets.

Explanation:

A defining variable is a symbol, such as x, used to define some numbers. When a variable is applied in a function, we know that it is not just one constant number, but that it can signify many numbers.

In mathematics, a variable is a symbol used to signify an arbitrary set or element.

Hope it helped..............