3 years ago

Please help!!!!!!!!!!!!!

Mathematics

1 answer:

Yuri [45]3 years ago

8 0

Answer:

37, 3, 37

Step-by-step explanation:

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Solve the system by substitution. x = -2y + 5 -8x – 3y = -1

mote1985 [20]

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3 years ago

Carla buys a dress that cost $20.00. She pays 7% sales tax. How much does she pay fo the dress, with tax? A. $21.40 B. $34.00 C.

Zarrin [17]

Answer:

Step-by-step explanation:

if its wrong sorry :( :(

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2 years ago

Read 2 more answers

Determine whether the vectors u and v are parallel, orthogonal, or neither. u = (5,4) v = (-10,9)

12345 [234]

Answer:

Neither

Step-by-step explanation:

5 x -10 = -50

4 x 9 = 36

-50 + 36 = -14 and therefore can not be orthogonal

sqrt(25+16)=sqrt(41)

sqrt(100+81)=sqrt(181)

sqrt(41) x sqrt(181) is not equal to -14 so therefore it is not parallel

So the answer is then neither

6 0

3 years ago

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You decide to play roulette 4 times, each time betting on red. What is the distribution of X, the number of times you win?

aalyn [17]

1.
If betting on red, 18/38 = 9/19 chance of winning, so 10/19 chance of losing
Chance of winning 4 times: (9/19)^4 = 6561/130321 =~ 5.034%
Chance of winning 3 times: (9/19)^3 * (10/19) * C(4,1) = 29160/130321 =~ 22.3755%
Chance of winning 2 times: (9/19)^2 * (10/19)^2 * C(4,2) = 48600/130321 =~ 37.2925%
Chance of winning 1 time: (9/19) * (10/19)^3 * C(4,3) = 36000/130321 =~ 27.624%
Chance of winning 0 times: (10/39)^4 = 10000/130321 =~ 76.7336%

3 0

3 years ago

A water well is to be drilled in the desert where the soil is either rock, clay or sand. The probability of rock P(R)equals=0.

GaryK [48]

The tree diagram for the probability is shown below

P(Clay|Positive) is read 'Probability of Clay given the result is Positive'.

This is a case of conditional probability.

The formula for conditional probability is given as
P(Clay|Positive) = P(Clay∩Positive) ÷ P(Positive)

P(Clay∩Positive) = 0.21×0.48 = 0.1008

P(Positive) = P(Rock∩Positive) + P(Clay∩Positive) + P(Sand∩Positive)
P(Positive) = (0.53×0.53) + (0.21×0.48) + (0.26×0.75)
P(Positive) = 0.2809 + 0.1008 + 0.195
P(Positive) = 0.5767

Hence,
P(Clay|Positive) = 0.1008÷0.5767 = 0.175 (rounded to 3 decimal place)

5 0

3 years ago