Describe how to find the sun P plus Q using a number line is P equals -19 and Q equals 12.1 first find blank on a number line, then count blank spaces to the right.

To find the sum of P and Q using a number line, you first need to locate P on the number line. Since P is -19, you would start at zero and move 19 spaces to the left (since it's a negative number) until you find the point marked -19 on the number line.

Next, you need to locate Q on the number line. As Q is 12.1, you would start from the point where -19 is marked and count 12 spaces to the right (as Q is positive) until you find the point marked 12.1 on the number line.

Finally, you would add the position of Q (12.1) to the position of P (-19) by counting the spaces to the right from -19. So, you would count 12 spaces to the right from -19 on the number line to find the sum of P plus Q.

To find the sum of P and Q using a number line, we will follow these steps:

Step 1: Locate point P on the number line:
- Start at the origin (0) on the number line.
- Since P is -19, count 19 spaces to the left of the origin (-19).

Step 2: Locate point Q on the number line:
- Once you have located point P, count 12.1 spaces to the right from point P.
(Note: Since Q is 12.1, we need to move slightly more than 12 spaces to the right. To locate the decimal fraction, we can either estimate or divide the interval between two whole numbers into 10 equal parts and count accordingly.)

Step 3: Find the sum of P and Q:
- Add the value of P (-19) to the value of Q (12.1).

The sum of P and Q will be the point on the number line obtained by counting spaces from the origin.