What is the equation for the rational function?

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21