An object that is 90 in long is being drawn on two different blueprints. On blueprint A, a scale of 1in: 1ft is being used. On Blueprint B, a scale of 1in:30in is being used. what is the difference, in inches, between the lengths of the drawings

4.5 in

Step-by-step explanation:

A scale is used to make a smaller replica of an object. You can find out the size of the smaller model by multiplying the original size with the scale ratio. One foot equal to 12 inches, so the scale for blueprint A is 1 in:12in. The length of the drawing of blueprint A will be 90 inches * 1 in/12 in= 7.5 in

On the other side, the blueprint B scale is 1 in:30 in, then the length of blueprint B will be: 90 inches* 1 in/ 30 in = 3 in

The difference in the length of the two drawings will be 7.5 in - 3 in = 4.5 in

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.