Final answer:
To find the number of trees in each row, set up an equation. Solve the equation to find the number of trees in each row.
Step-by-step explanation:
To find the number of trees in each row, we can first set up an equation based on the information given. Let's use the variable 'x' to represent the number of trees per row. Since the number of rows exceeds the number of trees per row by 4, we can write the equation as: x + 4 = 780. Now, we can solve for 'x' by subtracting 4 from both sides of the equation: x = 780 - 4 = 776. Therefore, there are 776 trees in each row.