How can you model multipaction problems?

What are the domain and range of the function? f(x) = -4 (sqrt)x

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap

If a and b represent positive real numbers what is the inequality when solves for v