Need Help. ( Look at the picture). Will Mark Brainliest. Graph the step function over the interval. [ Please Show me on paper]. [ Only Answer if you truly know how to work this problem please and thank you]

I have an answer for you. This answer uses unclosed (white-center) holes to show "the value is not here" and closed (black-center) holes to show "the value is here." This step function is a "round up" of x+3, so it is exactly at y=3 at x=0.
Thank you for the Brainliest!