What do the properties of polynomial addition mean? Complete each statement. The closure property states that the sum of two polynomials is a
.

The commutative property states that changing the order of two or more terms

the value of the sum.

The associative property states that the way in which two or more terms are grouped in a sum

the value.

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables