PLEASE HELP ME
Hello I have some math question that I need help answering I will possibly mark the helper brainiest if I find it very helpful.

1.you have ten mangos and twelve avocados that cost 23$, five mangos and four avocados that cost 10$. How much does one mango and on avocado cost?

2. what would be a reasonable domain for f(x)= -2/3x + 4 when school uses x bottles of hand sanitizer per month?