I think you mean parentheses. Parentheses are ().
There are many things that could be meant by a fixed budget. It could mean that you only have a limited amount of money to spend.
Function.
Parentheses are brackets which are rounded kind. Like the one below: ( ..... )
A spreadsheet means a computer application that is used to simulate paper accounting.
Anything within parentheses should be calculated first.
paint it on the spreadsheet
Negative.
A budget is where you have a certain amount of money that you have to spend and you cant go above your budget.
The information in parentheses could mean you do that section first, (PEMDAS) , or it could have two parentheses to make the equivalent of a multiplication problem, such as (2)(3), or (2 + 3)(2 + 3) , which in that case you must use the distributive property.
It depends what subject you use it for. For example, if you use parentheses in terms of language arts then, it would be the same thing no matter how you use it. In that case, it means you want to add extra information that isn't necessarily essential to the meaning. It can also be the definition of a term. If you use parentheses in math, then it can mean to multiply. It can also mean to work what is inside the parentheses first.
For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses.