What is the vertex of the graph of this equation y= -3x2 - 12x - 9?

What is the value of x in the diagram below?

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.

Here is another math questions. i will keep asking different questions. 4^2x=6