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mr Goodwill [35]
3 years ago
8

What is the solution to the system of equations below?

Mathematics
2 answers:
sergij07 [2.7K]3 years ago
6 0
D) because the first equation*3-the second equation*;
the left side=0, the right side = 36
eimsori [14]3 years ago
6 0
4x - 7y = -2....multiply by -3
12x - 21y = -42
------------------
-12x + 21y = 6 (result of multiplying by -3)
12x - 21y = -42
----------------add
0 = - 36 (incorrect)
This system has no solution <=
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If Karri takes a 7 question true false test and guess on every question, what is the
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Answer:

The  probability that she gets all 7 questions correct is 0.0078.

Step-by-step explanation:

We are given that Karri takes a 7 question true-false test and guess on every question.

The above situation can be represented through binomial distribution;

P(X = r) = \binom{n}{r} \times p^{r} \times (1-p)^{n-r} ; x = 0,1,2,3,........        

where, n = number of samples (trials) taken = 7 question

            r = number of success = all 7 questions correct

            p = probability of success which in our question is probability that

                   question is correct, i.e. p = 50%

Let X = <u><em>Number of question that are correct</em></u>

So, X ~ Binom(n = 7, p = 0.50)

Now, the  probability that she gets all 7 questions correct is given by = P(X = 7)

         P(X = 7)  =  \binom{7}{7} \times 0.50^{7} \times (1-0.50)^{7-7}

                        =  1 \times 0.50^{7} \times 0.50^{0}

                        =  <u>0.0078</u>

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3 years ago
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Step-by-step explanation:

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46. Fortysix times 2 equals 92.
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Among 500 freshmen pursuing a business degree at a university, 311 are enrolled in an economics course, 243 are enrolled in a ma
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Solution :

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b). n(A only) = 311 - 135

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                   = 108

Exactly one of these two courses

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Answer:

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Step-by-step explanation:

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8 0
2 years ago
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