i writing the answers down for you

1.3/5
2.56 to 81
3.76:107
4.9:21
im sacrificing my grade for the rest of you, good luck and have a good rest of the year, also this is of 2022.

Thank you for providing the answers, but it seems like you have shared a list of numerical expressions rather than questions. If you have any specific questions or topics you'd like to learn about, please let me know and I'll be happy to help!