How do the mathematical domain and reasonable domain compare

How do you solving the solution of each system using elimination?

Agarden consists of an apple tree, a pear tree, cauliflowers, and heads of cabbage. there are 40 vegetables in the garden. 24 of them are cauliflowers. what is the ratio of the number of cauliflowers to the number of heads of cabbage?

Factor the expression using the gcf. the expression 21m−49n factored using the gcf