The image shows a number line with an arrow pointing from $-3$ to $1$. Below the number line, there is an equation with two blank spaces to be filled in, indicated by question marks.

To solve the problem:

1. The number line indicates the movement from $-3$ to $1$, so we can determine the distance between these two points.

   $1 - (-3) = 1 + 3 = 4$

   This means the total distance covered is 4 units.

2. The first blank likely asks for the starting number, which is $-3$.

3. The second blank asks for the total distance, which we just calculated to be 4.

Thus, the blanks should be filled in as:

• First blank: $-3$
• Second blank: $4$

Would you like any further details or have any questions? Here are 5 related questions that can deepen your understanding:

1. What does it mean to calculate distance on a number line?
2. How do we add and subtract negative numbers?
3. How do we represent intervals on a number line?
4. How do we calculate the absolute value of a number?
5. Can you think of a real-life situation where you would use a number line?

Tip: When working with negative numbers, always pay close attention to the signs during addition or subtraction to avoid errors.