1- Diante da expressão, sendo x= 2-5 e y=2-2 . Os alunos do 8 ano do colégio Santana Lima, Nicolas

e Rudinei optam por resolvê-la de maneiras diferentes. Nicolas decide subtrair os valores de x e y na

expressão para em seguida resolvê-la, enquanto Rudinei prefere simplificar ao máximo a expressão,

utilizando conceitos que aprendeu em anos anteriores, para só então fazer a subtração.

2

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6

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2

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4

6

4

Escolha um dos métodos de resolução e responda o problema.

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:

24pi or letter c

emily solved for a part when she should have solved for the whole. 875,000 should be the numerator of the equivalent ratio. 70 x 12,500 is 875,000. so the answer is 100 x 12,500 which is 1,250,000.