Final answer:
The midpoint between -8.6 and 2.8 on a number line is calculated by adding the two numbers and then dividing by 2, resulting in a midpoint of -2.9.
Step-by-step explanation:
To find the midpoint between two numbers on a number line, you add the two numbers together and then divide by 2. In this case, the two numbers are -8.6 and 2.8.
First, add the two values:
-8.6 + 2.8 = -5.8
Then, divide the sum by 2 to get the midpoint:
-5.8 / 2 = -2.9
So, the midpoint of -8.6 and 2.8 on a number line is -2.9.