Both are correct they just chose a different variable to solve for first. they will both get correct answers if they do the rest correctly.
In this equation y would equal 4 or it could be 1
The area of D is given by:

The average value of f over D is given by:
Answer:
nidE sme olome tib ary dae usa arajkpnoder xd jsaludos aja lpa
Step-by-step explanation: