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Lostsunrise [7]
4 years ago
12

Solve the equation, , using the quadratic formula.

Mathematics
1 answer:
mars1129 [50]4 years ago
7 0

Answer:

\frac{-5+/-\sqrt{42} }{8}

Step-by-step explanation:

The quadratic formula is x=\frac{-b+/-\sqrt{b^2-4ac} }{2a}. Here a=4, b=5, and c=-1.

Substitute and you'll have:

x=\frac{-b+/-\sqrt{b^2-4ac} }{2a} =\frac{-5+/-\sqrt{5^2-4(4)(-1)} }{2(4)}=\frac{-5+/-\sqrt{25+17} }{8)}

\frac{-5+/-\sqrt{42} }{8}

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Jin bought a pair of pants that cost $47.83. The sale tax in her state is 7.43 % what is the total cost of the pants ?
maxonik [38]

Answer:

$51.38

Step-by-step explanation:

7.43% of 47.83=(rounded to the nearest hundredth) 3.55

7.43/100*x/47.83

x=3.55

because we are solving for x

we can also cross check by taking out the percentage

x/100*3.55/47.83

47.83x=355

x=7.42212000836

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3 years ago
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Answer:// Solve equation [1] for the variable  y

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  [2]    -2•(2x-3) + 2x = 2

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// Solve equation [2] for the variable  x

  [2]    2x = 4

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// By now we know this much :// Solve equation [1] for the variable  y

 [1]    y = 2x - 3

// Plug this in for variable  y  in equation [2]

  [2]    -2•(2x-3) + 2x = 2

  [2]     - 2x = -4

// Solve equation [2] for the variable  x

  [2]    2x = 4

  [2]    x = 2

// By now we know this much :

   y = 2x-3

   x = 2

// Use the  x  value to solve for  y

   y = 2(2)-3 = 1

   y = 2x-3

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// Use the  x  value to solve for  y

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Step-by-step explanation:

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Step-by-step explanation:

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Mean= (3+4+5+6+6+7+9+28) ÷8

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Step-by-step explanation:

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