2 (c) Screen images are made up of units of light called pixels.
Pixels per square inch (PPI) is a measure of image quality.
The higher the pixels per square inch, the better the image quality.
N
PP12 =
A
Where: N is the number of pixels
A is the area of the screen in square inches
Liam's old screen has a PP12 value of 9800
He wants to buy a new screen with a better image quality.
Liam sees a rectangular screen that has:
a width of 101.6 cm
width: height ratio of 16:9
8.28 million pixels
He works out that this will have a better image quality than his old screen.
Is Liam correct? Show your working.
Use the conversion: 1 inch = 2.54 cm
[4 marks]​

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Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours

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