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Eddi Din [679]
3 years ago
11

Find the length of the side of a square with an area of 169 A.338 B.106 C.26 D.13

Mathematics
2 answers:
Fantom [35]3 years ago
7 0
Side x side=area of a square
s^2=169
s= square root of 169
s=13
D.
Hope this helps. 
Nitella [24]3 years ago
4 0
All you need to do is to find the square root of 169, so the answer is D:13
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James wants to pour a patio that is 18 feet by 20 feet. He wants the concrete to be 6 inches deep. How many cubic feet of concre
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The correct answer would be C) 180 cubic feet.

WORK:  18 x 20 = 360, 6/12 = 0.5... then multiply 360 x 0.5 and you get 180
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3 years ago
In the game of​ roulette, a wheel consists of 38 slots numbered​ 0, 00,​ 1, 2,..., 36. To play the​ game, a metal ball is spun a
Oxana [17]

Answer:

E(X)=-0.0526

Sd(X)=5.763

Step-by-step explanation:

In statistics and probability analysis, the expected value "is calculated by multiplying each of the possible outcomes by the likelihood each outcome will occur and then summing all of those values".

The variance of a random variable Var(X) is the expected value of the squared deviation from the mean of X, E(X).

And the standard deviation of a random variable X is just the square root of the variance.  

Let X be a random variable which denotes the money you may win or lose on each spin.

In the game of roulette, a wheel consists of 38 slots. To play the game, a metal ball is spun around the wheel and is allowed to fall into one of the numbered slots. If the number of the slot the ball falls into matches the number you selected, we win $35; otherwise we lose $1.  So we have just one possibility to win and 37 of lose on an individual game.

___________________________

X            P(X)

___________________________

35           1/38

-1            37/38

___________________________

In order to calculate the expected value we can use the following formula:

E(X)=\sum_{i=1}^n X_i P(X_i)

And if we use the values obtained we got:

E(X)=(35)*(\frac{1}{38})+(-1)(\frac{37}{38})=-0.0526

In order to find the standard deviation we need to find first the second moment, given by :

E(X^2)=\sum_{i=1}^n X^2_i P(X_i)

And using the formula we got:

E(X^2)=(35^2)*(\frac{1}{38})+((-1)^2)(\frac{37}{38})=33.211

Then we can find the variance with the following formula:

Var(X)=E(X^2)-[E(X)]^2 =33.211-(-0.0526)^2 =33.208

And then the standard deviation would be given by:

Sd(X)=\sqrt{Var(X)}=\sqrt{33.208}=5.763

4 0
3 years ago
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lord [1]
825
Because when we did that we got
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3 years ago
The function y = -15 +2100 can be used to model the height, y, of a parachute jumper x seconds after she jumps from an airplane.
Aleks04 [339]
Did you mean to put a x after -15?
7 0
2 years ago
Read 2 more answers
H
Keith_Richards [23]

Answer:

3

Step-by-step explanation:

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