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kramer
3 years ago
8

-10 + 4plz heeeeeelp

Mathematics
2 answers:
zimovet [89]3 years ago
8 0

Answer:

-6

Step-by-step explanation:

Natasha_Volkova [10]3 years ago
8 0

Answer:

- 6

Step-by-step explanation:

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GarryVolchara [31]
7.75 is the answerto the equation

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3 years ago
A rectangular poster has a length of 24 inches, and its width is 12 inches.What is the perimeter of the poster?
zavuch27 [327]
P=2(L+W)
P=2(24+12)
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3 years ago
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A box contains 5 red and 5 blue marbles. Two marbles are withdrawn randomly. If they are the same color, then you win $1.10; if
topjm [15]

Answer:

a) The expected value is \frac{-1}{15}

b) The variance is  \frac{49}{45}

Step-by-step explanation:

We can assume that both marbles are withdrawn at the same time. We will define the probability as follows

#events of interest/total number of events.

We have 10 marbles in total. The number of different ways in which we can withdrawn 2 marbles out of 10 is \binom{10}{2}.

Consider the case in which we choose two of the same color. That is, out of 5, we pick 2. The different ways of choosing 2 out of 5 is \binom{5}{2}. Since we have 2 colors, we can either choose 2 of them blue or 2 of the red, so the total number of ways of choosing is just the double.

Consider the case in which we choose one of each color. Then, out of 5 we pick 1. So, the total number of ways in which we pick 1 of each color is \binom{5}{1}\cdot \binom{5}{1}. So, we define the following probabilities.

Probability of winning: \frac{2\binom{5}{2}}{\binom{10}{2}}= \frac{4}{9}

Probability of losing \frac{(\binom{5}{1})^2}{\binom{10}{2}}\frac{5}{9}

Let X be the expected value of the amount you can win. Then,

E(X) = 1.10*probability of winning - 1 probability of losing =1.10\cdot  \frac{4}{9}-\frac{5}{9}=\frac{-1}{15}

Consider the expected value of the square of the amount you can win, Then

E(X^2) = (1.10^2)*probability of winning + probability of losing =1.10^2\cdot  \frac{4}{9}+\frac{5}{9}=\frac{82}{75}

We will use the following formula

Var(X) = E(X^2)-E(X)^2

Thus

Var(X) = \frac{82}{75}-(\frac{-1}{15})^2 = \frac{49}{45}

7 0
3 years ago
Skew lines a and b represent Donna's and Charlie's paths as they simultaneously walk on the first and second level of a shopping
vlabodo [156]

Answer: They cannot meet because two skew lines do not intersect each other.


Explanation:


Skew lines is a concept used in geometry to define lines that do not intersect each other but are not parallel.


In this case, the lines are not parallel because they lie in different planes, which in turn, do not intersect each other.


Therefore, runing the lnes in different planes and in different directions, they cannot not, in spite of not being parallel, intersect each other, which is called that the lines are skewed.


Donna's and Charlie's paths are an exelent illustration of what skew lines are: since Donna's and Charlie are in different levels, as long as each remains in parallel levels, their paths wiil not meet each other.


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3 years ago
19 is greater than the sum the number n and 3
masha68 [24]
Your answer should be 19>n+3
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2 years ago
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