Astate park charges an entrance fee of $20, plus $18 for each night of camping.
a family spends a total of $218 for staying at the park.
how many nights did the family stay at the park?

Family stayed at park for 11 nights.

Step-by-step explanation:

State park charges entrance fees = $20

In addition to this fees it charges per night for camping = $18

If a family spends x nights in the park for night camping then charges

= $(20 + 18x)

A family spends a total of $218 for night stay

then 218 = 20 + 18x

18x = 218 - 20

18x = 198

x =

x = 11

Therefore, family stayed at park for 11 nights.

d

step-by-step explanation:

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.