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Artemon [7]
3 years ago
9

Solve this system of equations: y = 2t^2 + 3t + 500 and y = 3t^2 + t + 300

Mathematics
1 answer:
Jet001 [13]3 years ago
7 0
2t^2 =4t+3t=5t
5t+500
3t^2=9t+t=10t
10t+300
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Answer:

Mean: 1.5

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Step-by-step explanation:

2/3 of the pages have diagrams, and N is the number of pages Harlee reads to reach a page with a diagram. In order to find the mean, divide 1/(2/3) to get 1.5 as your mean, and then divide sqrt(1-(2/3))/2/3 to get .8660, which rounds to .9.

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Tom bought 3 packages of Skittles for $1.25 each. How much did he spend?
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A car dealership sells 0, 1, or 2 luxury cars on any day. When selling a car, the dealer also tries to persuade the customer to
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Answer:

Mean = 1.42

Variance = 0.58

Step-by-step explanation:

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mean and variance of X

Solution:

From the given joint probability function of X and Y,

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Mean of X:

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Variance of X:

E(X^2)=\sum X^2P(X)\\=0^2\left ( \frac{1}{6} \right )+1^2\left ( \frac{3}{12} \right )+2^2\left ( \frac{7}{12} \right )\\=0+\frac{3}{12}+\frac{28}{12}\\=\frac{31}{12}

var(X)=E\left [ X^2 \right ]-\left ( E\left [ X \right ] \right )^2\\=\frac{31}{12}-\left ( \frac{17}{12} \right )^2\\=\frac{31}{12}-\frac{289}{144}\\=\frac{372-289}{144}\\=\frac{83}{144}\\=0.58

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