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The exponential model A = 388.9 0.006 describes the population, A. of a country in millions, tyears after 2003. Use the model to determine when the
population of the country will be 423 million

A) The total length of the two sides is

B) The total length of the third sides is

C) Polynomials are closed under addition and subtraction.

Step-by-step explanation:

Here, the sides of the given triangle are:

Side 1:

Side 2:

The perimeter of the triangle  =

(1) The total length of the two sides, 1 and 2

=  Length of ( Side 1 + Side 2)

=

So, the total length of the two sides is

(2) The Perimeter of the Triangle  = Sum of all 3 sides

⇒Length of ( Side 1 + Side 2 + Side 3) =

or, Sum of two sides  + Third side =  

or,   +  Third side =  

⇒Third side  =  

                     =

So, the total length of the third sides is

C) closed under addition and subtraction:

Polynomials are always CLOSED under addition and subtraction,as after adding two polynomials, we always get another polynomial.

Similarly, after subtraction two polynomials, resultant is also a polynomial.

As it is evident from A and B also.