. Which statement cannot be justified by one
of the properties of real numbers?
A. (a + b) + c = a + b + c)
B. a - (b + c) = (a - b) + C.
c. (able = a(bo)
D. (a + b) + 0 = 0 + (a + b)

as

so

the statement B i.e.    can not be justified by one

of the properties of real numbers.

Step-by-step explanation:

The statement B cannot be justified by one  of the properties of real numbers,

Given the statement

solving the L.H.S of the above equation

Distribute Parenthesis

so

Therefore,  can not be justified by one

of the properties of real numbers.

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

answer: 80,000

step-by-step explanation:

the population doubles every day.

10,000*2=20,000 day 4

20,000*2=40,000 day 5

40,000*2=80,000 day 6