Does anyone know the answer, you don’t need to answer if that’s okay

What is the value of x when x + 7 = 21?

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.

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625