Domains of rational Expressions don't understand

(x^2-25) / 2

What are the subsets of the set {7, 8, 9}?

A music teacher budgets $150 for a new book. The minimum cost of a new book is $12. How many books can she buy? Is this a minimum or a maximum amount? Explain.

the half life of polonium is 139 days. you have a brand new sample of polonium that will not be useful to you after 80% of the material hasdistegraded. For how many days will you be able to use the polonium?

Two numbers are In ratio 5:3, if the differ by 18 what are the numbers

If a country's debt-to-GDP ratio is 84%, the country is producing more than it is borrowing. A. True B. False

Matthew wants to shoot up the school he has 3 guns he only has 4 magazines for each gun he wants to have 4 more mags with 9-11 bullets

Use prime factorization to find the gcf of 24,48

Find the median of 3,7,2,9,4,7,3,7,5,2

4x-4=4x + what equals no values of x

Rena spent 6 days reading her book completing the same fraction of the book each day, she read a total of 8/9 of her book what fraction of her book did she complete in 6 days?