Astore sells almonds for $7 per pound, cashews for $10 per pound, and walnuts for $12 per pound. a customer buys 12 pounds of mixed nuts consisting of almonds, cashews, and walnuts for $118. the customer buys 2 more pounds of walnuts than cashews. the matrix below represents this situation.

Step-by-step explanation:

Let the customer buys, x pounds of almonds, y pounds of cashews and z pounds of walnuts. Since he buys 12 pounds of mixed nuts

Then since total weight he purchases is 12, we get

x+y+z = 12...i

Next is rate of each nut multiplied by pounds and added give the total cost.

Hence we have

7x+10y+12z=118 ... ii

A customer buys 2 more pounds of walnuts than cashews.

z=y+2 or

y-z=-2 ....iii

This can be written in matrix form as

Ax =B

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.