Marco has 84 coins in dimes and quarters. the ratio of the number of dimes to quarters is 3: 4. a) find the number of dimes. b) calculate the value of marco's coins.

Step-by-step explanation:If you have 84 coins total and your ratio of dimes to quarters is 3:4,that is 7 coins.

12 times 7 is 84.

At this ratio you will have 36 dimes and 48 quarters.

36 dimes is $3.60 and the value of the quarters is $12.

Added together they have a value of $15.60

can someone answer this question plz

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.