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Iteru [2.4K]
2 years ago
7

-7x-2y=-13 x-2y=11 solve for x and y

Mathematics
1 answer:
Akimi4 [234]2 years ago
4 0

Answer:

x=3

y=-4

I suggest you use m a t h w a y :)

Step-by-step explanation:

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On a multiple-choice test. Abby randomly guesses on all seven questions. Each question
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0.173 probability that she gets exactly three questions correct.

Step-by-step explanation:

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Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

Seven questions:

This means that n = 7

Each question has four choices.

Abby guesses, which means that p = \frac{1}[4} = 0.25

Find the probability to the nearest thousandth, that Abby gets exactly three questions correct.

This is P(X = 3).

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Evgesh-ka [11]

Answer:

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Step-by-step explanation:

Given

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3 years ago
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