4 years ago

Can someone help me??

Mathematics

1 answer:

KonstantinChe [14]4 years ago

6 0

1) 299,792

2)idk

3)one billion

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Step-by-step explanation:

4x+2x+x+9x=16x

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A jar of 36 coins contains 9 pennies. What percent of the coins are Pennies

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muminat

Answer:

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=5-10.5

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3 years ago

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39. Solve this system: 3x+y=-7 . 4x-y=14A. (–1, 10)B. (1, –10)C. (–1, –10)D. no solution

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Given,

The linear pair of the equation is,

$\begin{gathered} 3x+y=-7 \\ 4x-y=14 \end{gathered}$

Required

The solution of the linear equation.

Taking the equation first as,

$\begin{gathered} 3x+y=-7 \\ y=-7-3x \end{gathered}$

Substituting the value of y in second equation then,

$\begin{gathered} 4x-y=14 \\ 4x+7+3x=14 \\ 7x+7=14 \\ 7x=7 \\ x=1 \end{gathered}$

Substituting the value of x in first equation then,

$\begin{gathered} 3x+y=-7 \\ 3(1)+y=-7 \\ y=-7-3 \\ y=-10 \end{gathered}$

Hence, the solution of the system is (1, -10).

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1 year ago