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3 years ago

Please help me solve

Mathematics

1 answer:

Inga [223]3 years ago

3 0

Answer:

s= -2

Step-by-step explanation:

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Trinity solved the equation 2(x-3)+7-3x=11.

lukranit [14]

Answer:

$x=-10$

Step-by-step explanation:

$2(x-3)+7-3x=11$

$2\left(x-3\right)+7-3x-7=11-7$

$2\left(x-3\right)-3x=4$

$-x-6=4$

$-x-6+6=4+6$

$-x=10$

$\cfrac{-x}{-1}=\cfrac{10}{-1}$

$x=-10$

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2 years ago

Last month Christopher practiced his violin for 16 hours and Patrick practiced his cello for 780 minutes how many more hours did

zysi [14]

Answer:

Christopher practiced 3 ore hors

Step-by-step explanation:

8 0

3 years ago

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What is the area of this trapezoid? Show your work and explain how you solved using First, Next, and Last.

Sergeeva-Olga [200]

Answer: am not sure but i tried my best

Step-by-step explanation: 9x9=81 10x10=100 13x13=169 add them all together 350

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4 years ago

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You and a friend play a game where you each toss a balanced coin. If the upper faces on the coins are both tails, you win $1; if

oksian1 [2.3K]

Answer: The mean and variance of Y is $0.25 and $6.19 respectively.

Step-by-step explanation:

Given : You and a friend play a game where you each toss a balanced coin.

sample space for tossing two coins : {TT, HT, TH, HH}

Let Y denotes the winnings on a single play of the game.

You win $1; if the faces are both heads

then P(Y=1)=P(TT)= $\dfrac{1}{4}=0.25$

You win $6; if the faces are both heads

then P(Y=6)=P(HH)= $\dfrac{1}{4}=0.25$

You loose $3; if the faces do not match.

then P(Y=1)=P(TH, HT)= $\dfrac{2}{4}=0.50$

The expected value to win : E(Y)= $\sum_{i=1}^{i=3} y_ip(y_1)$

$=1\times0.25+6\times0.25+(-3)\times0.50=0.25$

Hence, the mean of Y : E(Y)= $0.25

$E(Y^2)=\sum_{i=1}^{i=3} y_i^2p(y_i)\\\\=1^2\times0.25+6^1\times0.25+(-3)^2\times0.5\\\\=0.25+1.5+4.5=6.25$

Variance = $E[Y^2]-E(Y)^2$

$=6.25-(0.25)^2=6.25-0.0625=6.1875\approx6.19$

Hence, variance of Y = $ 6.19

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4 years ago

On the sea,distances are measured in nautical miles rather than miles.

Musya8 [376]

A. 97,280 feet

B. 18.42mph

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3 years ago