Find the number that when added to 2.2 produces the same result as the difference between 34.5 and 12.3.

Let the required number be 'x'.

Then,

x + 2.2 = 34.5 - 12.3

or, x = 34.5 - 12.3 - 2.2

or, x = 20

So, the required number is 20.

I know you go to aops...

Step-by-step explanation:

The smallest possible domain to completely graph two periods is either [0, 2π] or [-π, π].

Step-by-step explanation:

The period of cosine function [0, 2π].

The given function is

This function can be written as

         .... (1)

The general form of cosine function is

             .... (2)

where, A is amplitude, , C is phase and D is midline.

From (1) and (2), we get

The period of given function is [0,π]. So, the smallest possible domain to completely graph two periods is either [0, 2π] or [-π, π].