Pls help RN! asap!! pleasee

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.

What number should be added by both sides of the equation to complete the the square? x^2-10x=7