You started high school in 2013
The parameter can be represented as:
[tex]Graduate = 2017[/tex] --- year of graduation
The duration of high school for a student is:
[tex]Duration= 4[/tex] i.e. 4 years
To calculate the commencement year, we use the following formula
[tex]Graduation - Admission = Duration[/tex]
Make Admission the subject
[tex]Admission = Graduation - Duration[/tex]
[tex]Admission = 2017 - 4[/tex]
[tex]Admission = 2013[/tex]
This means that you started high school in 2013
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