PLEASE HELP ASAP Please do all 4

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

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.

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?