Write the rule for fractions with a denominator of 2 to change them to whole numbers and provide a reason. Also, find the rule for the number of sunflowers planted in each row based on the provided pa

To change a fraction with a denominator of 2 into a whole number, you need to multiply it by 2.

Multiplying a fraction by its denominator cancels out the denominator, resulting in the numerator as a whole number. For example, $\frac{x}{2} \times 2 = x$.

The rule is to $\boxed{\text{multiply by 2}}$.
The reason is that multiplying a fraction by its denominator will cancel out the denominator, leaving the numerator as a whole number.

$7 - 4 = 3$
$10 - 7 = 3$
$13 - 10 = 3$
The number of sunflowers increases by 3 for each subsequent row. This is an arithmetic sequence.

The general formula for an arithmetic sequence is $a_n = a_1 + (n-1)d$, where $a_n$ is the number of sunflowers in row $n$, $a_1$ is the number of sunflowers in the first row, and $d$ is the common difference.
Here, $a_1 = 4$ and $d = 3$.
So, $a_n = 4 + (n-1)3$
$a_n = 4 + 3n - 3$
$a_n = 3n + 1$

For $n=7$: $a_7 = 3(7) + 1 = 21 + 1 = 22$.

The completed table is:

The $\boxed{\text{35th row}}$ will have 106 sunflowers.