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Zolol [24]
3 years ago
7

Please help 30 points for a quick response!!

Mathematics
1 answer:
tigry1 [53]3 years ago
6 0
I think x is 15 I’m so sorry I’m just guessing
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AnnyKZ [126]

Step-by-step explanation:

Total area of merged figure = area of vertical rectangle + area of horizontal rectangle.

\therefore \: 3x(2x - 7) + (3x + 4)x = 85 \\  \\  \therefore \: 6 {x}^{2}  - 21x+ 3 {x}^{2}  + 4x = 85 \\  \\ \therefore \: 6 {x}^{2}  + 3 {x}^{2} - 21x + 4x  - 85 = 0 \\  \\ \huge \red {\boxed {\therefore \: 9 {x}^{2}  - 17x  - 85 = 0}} \\ hence \: proved.

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Tanya [424]

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The function f has an inverse because it is one-to-one.

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