What is a 2 dollar summary

How can a speaker best appeal to an audience? a. by revealing just enough information to make the au us b. by allowing the audience to ask questions about the speech's subject matter c. by adapting the speech to the expectations and knowledge of the audience d. by encouraging listeners who disagree to voice their opinions

The playwright would be able to express __ but the painter likely would not

Which function is positive for the entire interval (-3, -2]?