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3 years ago

Solve the equation for x 3x + 20 = x - 8

Mathematics

2 answers:

lesantik [10]3 years ago

4 0

Answer:

x=−14

Step-by-step explanation:

Step 1: Subtract x from both sides.

3x+20−x=x−8−x

2x+20=−8

Step 2: Subtract 20 from both sides.

2x+20−20=−8−20

2x=−28

Step 3: Divide both sides by 2.

−28

x=−14

spin [16.1K]3 years ago

4 0

Answer:

x = 9.33333333333

Step-by-step explanation:

How to solve...

3x + 20 = x - 8

+ 8 = x + 8

---------------------- ( add 8 on both sides )

3x + 28 = x

3x + 28 = 3x

---------------------- ( divide 3x on both sides )

28 = 3x

3 = x

---------------------- ( divide 28 by 3 )

x = 9.33333333333

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A student S is suspected of cheating on exam, due to evidence E of cheating being present. Suppose that in the case of a cheatin

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Answer:

Step-by-step explanation:

Suppose we think of an alphabet X to be the Event of the evidence.

Also, if Y be the Event of cheating; &

Y' be the Event of not involved in cheating

From the given information:

$P(\dfrac{X}{Y}) = 60\% = 0.6$

$P(\dfrac{X}{Y'}) = 0.01\% = 0.0001$

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Thus, $P(Y') \ will\ be = 1 - P(Y)$

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$P(Y'X) = P(Y') \times P(\dfrac{X}{Y'})$

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(b)

The required probability that the evidence is present is:

P(YX or Y'X) = 0.006 + 0.000099

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(c)

The required probability that (S) cheat provided the evidence being present is:

Using Bayes Theorem

$P(\dfrac{Y}{X}) = \dfrac{P(YX)}{P(Y)}$

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