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Butoxors [25]
3 years ago
11

Please help !!

Mathematics
2 answers:
xxMikexx [17]3 years ago
5 0
I hope this helps you

Lady_Fox [76]3 years ago
4 0
#1)h^2+4h
#2)k^2-9k
#3)9a^2+9
#4)6p^2-48
#5)-6c^2-15
#6)-8g^2-28
#7)x^2-x^+3x
#8)15m^4-5m^2-35
#9)-3n^2+6n-24
#10)-12x^2+24x-36

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In answering a question on a multiple-choice test, a student either knows the correct answer or guesses it. Let 0.7 be the proba
Dahasolnce [82]

Answer:

The probability is 0.9211

Step-by-step explanation:

Let's call K the event that the student know the answer, G the event that the student guess the answer and C the event that the answer is correct.

So, the probability P(K/C) that a student knows the answer to a question, given that she answered it correctly is:

P(K/C)=P(K∩C)/P(C)

Where P(C) = P(K∩C) + P(G∩C)

Then, the probability P(K∩C) that the student know the answer and it is correct is:

P(K∩C) = 0.7

On the other hand, the probability P(G∩C) that the student guess the answer and it is correct is:

P(G∩C) = 0.3*0.2 = 0.06

Because, 0.3 is the probability that the student guess the answer and 0.2 is the probability that the answer is correct given that the student guess the answer.

Therefore, The probability P(C) that the answer is correct is:

P(C) = 0.7 + 0.06 = 0.76

Finally, P(K/C) is:

P(K/C) = 0.7/0.76 = 0.9211

7 0
3 years ago
I need it to be in least to greatest
Reil [10]
-28, -17, 22.4, |-27|
3 0
3 years ago
Read 2 more answers
Find the value of 3mm(m+y)​
malfutka [58]

Answer:

Step-by-step explanation:

3mn (m+y)

= 3m^{2}n + 3mny

4 0
2 years ago
Can someone help me? It's urgent and thank you!
tino4ka555 [31]

Answer:

480,700

Step-by-step explanation:

C(25,7)

25!/(7!*(25-7)!)

15511210043330985984000000/(6402373705728000*5040)

480700

8 0
2 years ago
A bag with 12 marbles has 3 red marbles and 5 yellow marbles. A marble is chosen from the bag at random. What is the probability
alexgriva [62]

Answer:

3/12 = 1/4

Step-by-step explanation:

There are 12 marbles in the bag.  If the marble drawn at random is red, it is one of the 3 red marbles.

The probability is "3 out of 12" = 3/12 which simplifies to 1/4.

7 0
2 years ago
Read 2 more answers
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