A jar contain 0.75 L of blackberry juice and 0.60 L of blueberry juice Patrick poured 0.25 L of Java juice into the jar he drank 0.20 of the mixture pour a writing expression to represent the total amount of juice left in the jar part B identify which property is used in each step simplify the expression

1.4 L

Step-by-step explanation:

It is given that a jar contains 0.75 L of blackberry juice and a 0.60 L of blueberry juice. After some time, Patrick tried to poured 0.25 L of Java juice into the mixture. He than drank 0.20 L of the juice mixture.

As the question is asking how many litres of juice is left in the jar, we will add 0.75, 0.60 and 0.25 litres together and then subtract the amount of juice Patrick had drunk, i.e. 0.20

∴( 0.75 + 0.6 + 0.25 )- 0.2

  = 1.4

The associative property is used in each step for the expression. It means that no matter how we group the numbers, the outcome will be he same.

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.