Select the correct answer. In 1946, Peter Goldmark created a mechanical device for a color television system. How did the device work?
A.
A red-blue-green thread was waved in front of a series of discs.
B.
A red-blue-green tube was swung in front of a beam of light.
C.
A red-blue-green wheel was rotated in front of a cathode ray tube.
D.
A red-blue-green box was placed in front of a row of lamps.

Which of the following is not contained on the slide show toolbar? a. next button b. slide button c. close button d. pen tool

3. when you right-click a linked spreadsheet object, what commands do you choose to activate the excel features? a. linked worksheet object > edit b. edit data > edit data c. linked spreadsheet > edit d. object > edit data

Which of the following statements is false? a. a class can directly inherit from class object. b. if the class you're inheriting from declares instance variables as private, the inherited class can access those instance variables directly. c. a class's instance variables are normally declared private to enforce good software engineering. d. it's often much more efficient to create a class by inheriting from a similar class than to create the class by writing every line of code the new class requires.