10 is 60% of what number please help​

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

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.

A10 inch cookie cake is divided into 8 slices. what is the area of 3 slices