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trasher [3.6K]
3 years ago
11

Factor completely 10xy + 3y + 20ax + 6a.

Mathematics
2 answers:
Sindrei [870]3 years ago
6 0

Answer:

Option 3 is correct.

Step-by-step explanation:

The given expression is

10xy+3y+20ax+6a

This expression can be written as

(10xy+3y)+(20ax+6a)

Take out the common factors from each parenthesis.

y(10x+3)+2a(10x+3)

Now, take out the common factor (10x+3).

(10x+3)(y+2a)

Therefore option 3 is correct.

stiv31 [10]3 years ago
3 0
10 xy + 3y + 20 ax + 6a = y(10x+3) + a(20x+6) = y(10x+3)+2a(10x+6)= 
(y+2a)(10x+3)
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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
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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:

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