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Free_Kalibri [48]
3 years ago
11

Help! 20 points. Show step-by-step solution.

Mathematics
1 answer:
IceJOKER [234]3 years ago
5 0
Use the quadratic formula and plug in the coefficients

3x - 9 {x}^{2} = - 10 \\ - 9 {x}^{2} + 3x + 10 = 0 \\ b = 3 \\ a = - 9 \\ c = 10 \\ - \frac{3 + \sqrt{ {3}^{2} - 4( - 9)(10) } }{2( - 9)} \\ \frac{ - 3 + \sqrt{9 + 360} }{ - 18} \\ \frac{ - 3 + 3 \sqrt{41} }{{ - 18} } \\ \frac{ - 1 + \sqrt{41} }{ - 6}

I wasn't able to the plus or minus sign in so I just used the plus sign you can look up the quadratic formula online
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What is 24/4 as a whole number
stiks02 [169]
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7 0
3 years ago
The weekly earnings of students in one age group are normally distributed with a standard deviation of 47 dollars. A researcher
ELEN [110]

Answer:

Option D) 340

Step-by-step explanation:

We are given the following in the question:

Alpha, α = 0.05

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Margin of error = 5

95% Confidence Interval:

\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}

\text{Margin of error} = z_{critical}\frac{\sigma}{\sqrt{n}}

Putting the values, we get,

z_{critical}\text{ at}~\alpha_{0.05} = 1.96

5 = 1.96(\dfrac{47}{\sqrt{n}} )\\\\\sqrt{n} = \dfrac{47\times 1.96}{5}\\\\n = 339.443776\\\Rightarrow n \approx 340

Thus, the correct answer is

Option D) 340

7 0
3 years ago
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kifflom [539]
(0,4)(2,-3)
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8 0
3 years ago
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A carpenter is building a rectangular room with a fixed perimeter of 440 ft. what are the dimensions of the largest room that ca
olga55 [171]
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4 0
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Andy's weight is 5 kilograms less than twice his brother's. Together they weigh 100 kilograms. What are their weights?
lakkis [162]

Answer:

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4 0
3 years ago
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