7. Which property of polynomials says that the sum of two polynomials is also a polynomial?

Closure property

Step-by-step explanation:

The closure property of polynomials for addition says that, if we add any two polynomials , the result is also a polynomial.

For is

is a polynomial.

is also a polynomial.

The sum of the two polynomials is

The result:

is also a polynomial.

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative