Let x be the number of sunflowers in each row.
Mark planted a total of 72 sunflowers. Since the sunflowers are planted in equal rows.
The equation we get,
x × 2x =72
simplifying the eq.
2x² =72
divide the eq. By
x² = 36
Now take the square root both the side we get
x= 6
therefore, Mark planted 6 sunflowers in each row.