Sorry I cannot help, you have not given us enough information to help you. Which of the many Arduinos are your using? What 7-segment display, post a link to its technical specifications.
Highly unlikely. But again it depends on what you have and how you have connected it. Start with an annotated schematic that will at least give us an idea of how it is connected to the Arduino.
That sounds like a great starting project that could be a lot of fun for both of you.! However, Please keep in mind that we are not a free design or code-writing service. We’re more than happy to help with your design or code, but we need you to make an initial attempt. Please design and write your code the best you can, then post it along with an annotated schematic and an explanation of what’s not working properly. There is also a for hire section if you want to pay for it.
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Show Your Work First: Before asking for assistance, make an attempt to design or write the code yourself. Share your work along with details about what isn’t working. That includes a preliminary schematic that you drew.
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Provide Clear Documentation: Since we can’t see, touch or feel your project, share an annotated schematic (best) or a clear drawing of your setup. Clear Pictures are welcome, but avoid using Fritzing diagrams as they are wiring diagrams, not schematics, and are not ideal for troubleshooting.
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Include Technical Details: If there is specific hardware involved such as displays, include links to technical information. There are often many versions of similar components, so precise details are essential. I will assume the processor is a UNO. Many times the processor is stated as ESP32, please state which one and post a link to it.
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Reference Resources: For additional help, check out useful links and tutorials: Useful Links on Arduino Forum. Of course one of the better sources of information (in my opinion) is the Arduino Cookbook. Skim it cover to cover and stop on any project that interests you.
I believe you will find most if not all of your project explained in the Arduino Cookbook.