Ramann03
10.06.2020 •
Mathematics
The number 100 is decreased to 36. What is the percentage by which the number was decreased, to the nearest tenth of a percent?
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Ответ:
Ответ:
x^2-4x-96=0
(x-12)(x+8)=0
(x-12)=0 or (x+8)=0
x=12 or x=-8 -> not x=-8 because you can't have a negative x
12x2 + (12-4)x2 =
24 + 16 = 40