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ohaa [14]
3 years ago
7

The black graph is the graph of y=f(x). Choose the equation for the red graph.

Mathematics
1 answer:
FromTheMoon [43]3 years ago
4 0

Answer:

d

Step-by-step explanation:

The red graph is an enlargement of the black graph.

Note coordinates of vertices of black graph to coordinates of red graph

(2, 2 ) → (2, 4 )

(4, - 2 ) → (4, - 4 )

(- 2, - 2 ) → (- 2, - 4 )

The y- coordinates of the red graph are twice the y- coordinates of the black graph.

and

\frac{y}{2} = f(x) ← multiply both sides by 2

y = 2f(x) ← as required, thus

equation of red graph is

\frac{y}{2} = f(x) → d

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Graph this compound inequality 2.5 is equal to or less than x is equal to or less than 4.5

2.5 <= x < = 4.5

We graph this inequality using number line.

Here x lies between 2.5  and 4.5

While graphing, we start with closed circle at 2.5 because we have equal symbol .

Then shade till 4.5. Use closed circle at 4.5.

The graph is attached below.


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3 years ago
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Answer:

B.x^{2} +2x-8

Step-by-step explanation:

Here the best method to solve is by substituting the end values of the set in each option , otherwise it will a time consuming problem.

Now substitute x=-4 in all the options

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16+8-8=16>0

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B.x^{2} +2x-8

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A.x^{2} -2x-8

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3 years ago
A student answers a multiple-choice examination question that offers four possible answers. Suppose the probability that the stu
Salsk061 [2.6K]

Answer:

The value is P(A | W) =  0.941

Step-by-step explanation:

From the question we are told that

The probability that the student knows the answer to the question is P(A) =  0.8

The probability that that the student will guess is P(G) =  0.2

The probability that that the student get the correct answer given that the student guessed is P(W /G) =  0.25

Here W denotes that the student gets the correct answer

Generally it a certain fact that if the student knows the answer he would get it correctly

So the probability the the student got answer given that he knows it is

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Generally from Bayes theorem we can mathematically evaluate the probability that the student knows the answer given that he got it correctly as follows

P(A | W) =  \frac{ P(A) *  P(W | A )}{ P(A) *  P(W | A) + P(G) * P(W| G)}

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Answer:

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