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Leona [35]
2 years ago
12

Joe practiced his trumpet for 53 minutes a day for 20 days. Char practiced her trumpet for 35 minutes a day for 30 days. Which s

tatements about Joe and Char are correct? Select all that apply.
A.
Joe practiced a total of 1,530 minutes.

B.
Char practiced a total of 1,050 minutes.

C.
Together, Joe and Char practiced 2,580 minutes.

D.
Together, Joe and Char practiced 2,110 minutes
Mathematics
2 answers:
MA_775_DIABLO [31]2 years ago
8 0

Answer:

B. Char practiced a total of 1,050 minutes.

D. Together, Joe and Char practiced 2,110 minutes

Step-by-step explanation:

Just a cheerful teen willing to help,

as always, wishing you a splendiferous day (or night)

posledela2 years ago
4 0

Answer:

D is the answer............

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If abcd is dilated by a factor of 3, the coordinate of a would be?
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Answer: (-9, -3)

Step-by-step explanation:

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Which of the following best describes the slope of the line below?
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Answer:

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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
melisa1 [442]

Answer:

Mean = 1.42

Variance = 0.58

Step-by-step explanation:

Given: X denote the number of luxury cars sold in a given day, and Y denote the number of extended warranties sold.

Also, joint probability function of X and Y are given.

To find:

mean and variance of X

Solution:

From the given joint probability function of X and Y,

P(X=0)=\frac{1}{6}\\P(X=1)=\frac{1}{12}+\frac{1}{6}=\frac{1+2}{12}=\frac{3}{12}\\P(X=2)=\frac{1}{12}+\frac{1}{3}+\frac{1}{6}=\frac{1+4+2}{12}=\frac{7}{12}

Mean of X:

E(X)=\sum XP(X)\\=0\left ( \frac{1}{6} \right )+1\left ( \frac{3}{12} \right )+2\left ( \frac{7}{12} \right )\\=0+\frac{3}{12}+\frac{14}{12}\\=\frac{17}{12}=1.42

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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3 years ago
Why is it important to know the different properties of three-dimensional figures
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A two-dimensional shape has length and width. A three-dimensional solid shape also has depth. Three-dimensional shapes, by their nature, have an inside and an outside, separated by a surface. All physical items, things you can touch, are three-dimensional.



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