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drek231 [11]
3 years ago
6

Y=5x-115x -3y=3

Mathematics
1 answer:
IrinaK [193]3 years ago
3 0
The answer would be one solution.
(0, -1)

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In ABC, a = 13,b=21, and c = 27. Find mA.
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Answer:

Step-by-step explanation:

a = 13  ; b = 21  ; c = 27

S = (a + b + c)/2

   = \dfrac{13+21+27}{2}\\\\=\dfrac{61}{2}\\\\= 30.5

s- a = 30.5 - 13 = 17.5

s - b = 30.5 - 21 = 9.5

s  -c = 30.5 - 27 = 3.5

Area = \sqrt{s(s-a)(s-b)(s-c)}

        = \sqrt{30.5*17.5*9.5*3.5}\\\\=\sqrt{17747.1875} \\\\=133.21\\\\=133

\dfrac{cbSin \ A}{2}=133\\\\\dfrac{27*21*Sin A}{2}=133\\\\Sin \ A = \dfrac{133*2}{27*21}\\\\Sin \ A = 0.4691\\\\A = Sin^{-1} \ 0.4691\\\\\\

A = 27°

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3 years ago
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