Someone help please

Jessica is a custodian at oracle arena. she waxes 20 m2 of the floor in 3/5 of an hour. jessica waxes the floor at a constant rate. at this rate how many sqaures meters can she wax per hour

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