Final answer:
An aspect ratio of 4:3 means that the width of the screen is about 1.333 times the height. For a 15" TV made before 1996, the length is 15 inches and the width is 20 inches. For a 42" TV made before 1996, the length is 42 inches and the width is 56 inches.
Step-by-step explanation:
An aspect ratio of 4:3 means that the width of the screen is about 1.333 times the height of the screen. To determine the length and width of a 15" TV made before 1996, we can use the aspect ratio.
Let's assume the height of the screen is h inches. According to the aspect ratio, the width of the screen is 1.333 * h inches.
So for the 15" TV, the height is 15 inches and the width is 1.333 * 15 = 19.98 inches. Therefore, the correct answer is C: 15" TV: Length = 15 inches, Width = 20 inches.
Similarly, for the 42" TV, the height is 42 inches and the width is 1.333 * 42 = 55.89 inches. Therefore, the correct answer is D: 42" TV: Length = 42 inches, Width = 56 inches.