Correct answers only !
a monitor with a screen dimension ratio of 20: 4 is playing a video image with a dimension ratio of 9: 2 at its fullest size which left a pillar-boxed image. what percent of the screen’s area is occupied by the image?
a. 80%
b. 85%
c. 90%
d. 95%

Step-by-step explanation:

first question

Since the full height of the screen is used, we can find the desired fraction by finding the ratio of the width/height aspect ratio of the image to the screen.

  ((image width)/(image height)) / ((screen width)/(screen height))

  = (9/2)/(20/4) = 18/20 = 9/10 = 90%

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second question

For each of the 10 first digits, 9 second digits are allowed. For each of those, 9 third digits are allowed. The total number of available combinations is ...

  10 × 9 × 9 = 810