Mathematics: [tex] rac{12 + m}{? 20 + m} = 0.75[/tex]what is m?

[tex] \frac{12 + m}{? 20 + m} = 0.75[/tex]what - id1220075938453, jasminebaeeecx

Ответ:

ilonkaip6323

13.03.2022

$\dfrac{12+m}{20+m}=0.75\\\\20+m\neq0\to m\neq-20\\\\0.75=\dfrac{3}{4}\\\\\dfrac{12+m}{20+m}=\dfrac{3}{4}\ \ \ |\text{cross multiply}\\\\(12+m)\cdot4=(20+m)\cdot3\\\\(12)(4)+(m)(4)=(20)(3)+(m)(3)\\\\48+4m=60+3m\ \ \ |-48\\\\4m=12+3m\ \ \ |-3m\\\\m=12$

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Ответ:

nguyendavis17

06.02.2023

Mathematics

Step-by-step explanation:

D. 411.25

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$\frac{12 + m}{? 20 + m} = 0.75$ what is m?

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