Final answer:
To add 0.75, -1, and 0.45, you can first add 0.75 and -1, then add the result to 0.45. The sum is 0.20.
Step-by-step explanation:
To add the numbers 0.75, -1, and 0.45, we simply combine their values. First, we add 0.75 and -1, which equals -0.25. Then, we add -0.25 and 0.45, which equals 0.20. Therefore, the sum of 0.75, -1, and 0.45 is 0.20.
Learn more about Adding decimal numbers