COLLEGE Troy’s grandfather gave him $700 to start his college savings account. Troy’s grandfather also gives him $40 each month to add to the account. Troy’s mother gives him $50 each month but has been doing so for 4 fewer months than Troy’s grandfather. Write a simplified expression for the amount of money Troy has received from his grandfather and mother after m months.

Simplified expression for the amount is 10(9m + 50)

Step-by-step explanation:

If the total months that Troy's grandfather has given him money is m, then the number of months that Troy's mother has given him money is m - 4.

⇒ Total amount in account = 700 + 40m + 50(m - 4)

                                             = 700 + 40m + 50m - 200

                                             = 90m + 500 = 10(9m + 50)

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.