2. Using Java API methods saves programming time and improves program quality. (T/F) 3. All Java API methods are class methods. (T/F). 4. What does this statement do? import java.util.* [Don't just say, "It imports java util. Explain with different words.] In all Java API method headings, the method name is preceded by the name of a type (or the word void). What does that type name tell you? Assuming that x, y, and z are double variables, write Java statements that implement these mathematical operations: 5. 6. z square root of y z sin(x), where x is in degrees. b) c)