When 3 is added to thrice a certain number and the sum is doubled, the result
is 13 more than 5 times the original
number. Find the original number

what is the total surface area of the compound shape if it diameter is 24cm, if it slant height of the cone is 13cm and the height of the cylinder alone is thrice that of the cone alone.

When 3 is added to thrice a certain number =3+3x.

The sum is doubled = 2(3+3x).

The result is 13 more than 5 times the original number =2(3+3x)=13+5x.

that's the mathematical equation.

2(3+3x)=13+5x.

2×3+2×3x=13+5x.

6+ 6x=13+5x.

6+6x-5x=13.

6+x=13.

because 13 is positive when it crosses over it becomes negative.

13-6=x.

7=x.

7 is the answer.

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.

mx+89b(-98)nb

step-by-step explanation: