Ineed with number 5-8 i don’t know how to do this plzz show work i’m not understanding this

Which equation matches the graph shown ?

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.