12 gallons of water fill a tank to 3/4 capacity.
a. what is the capacity of the tank?
b. if the tank is then filled to capacity, how many half-gallon bottles can be filled with the water in the tank?

a. 16 gallons

b. 32 bottles

Step-by-step explanation:

a. Let the capacity of the tank = x gallon

Therefore,

x = 16 gallons

The capacity of the tank is 16 gallons.

If the tank is then filled to the capacity,

The number of   gallon bottles can be filled =  

=  

= 32 bottles

32 bottles can be filled from the tank fill with capacity.

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: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.