Help pls! geometry multiple choice

Do graduates from uf tend to have a higher income than students at fsu, five years after graduation? a random sample of 100 graduates was taken from both schools. let muf be the population mean salary at uf and let mufsu be the population mean salary at fsu. how should we write the alternative hypothesis?

Find the domain and range of the following function f(x) = 51x - 21+ 4

Pls the last one and it has to be like number 6