How Do I Do 28 And 29? Will Give Brainliest

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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.

Find the area of the shaded region.