What is not an input for a function?

Three times the sum of a number and seven is negative thirty-six. what is the number?

Which questions would most a reader identify the author's purpose for writing? check all that apply. what type of text is this? what type of reviews did the book receive? how many copies of the book have been sold? what is the central idea? how does this text make one feel?

If value of cos330° is √3/2 then find tan165°.