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2 years ago

4.2x = 13.23 (i need help please!!! it'd mean a lot!!!) its solving equations btwwww

Mathematics

2 answers:

Semenov [28]2 years ago

7 0

Answer: x=3.15
All you do is divide 13.23 by 4.2

Yuliya22 [10]2 years ago

3 0

Answer: the answer would be 3.15 (and btw I just got off this subject in math)

Step-by-step explanation: The reason the answer is 3.15 is because you line up the question (basically how you have it) and divide 13.23 by 4.2 and you get 3.15, hope that helps ;)

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In answering on a multiple choice test, a student either know the answer or guesses. Let p be the probability that the students

LenaWriter [7]

Answer:

$P(A_{1}|B ) =\frac{mp}{1+p(m-1)}$

Step-by-step explanation:

For mutually exclusive events as A1, A2, A3, etc, Bayes' theorem states:

$P(A|B)= \frac{P(B|A)P(A)}{P(B)}$

P(A|B) is a conditional probability: the likelihood of event A occurring given that B is true.

P(B|A) is a conditional probability: the likelihood of event B occurring given that A is true.

P(A) is the probability that A occurs

P(B) is the probability that B occurs

For this problem:

A1 is the probability that the student knows the answer

A2 is the probability that the student guesses the answer

B is the probability that the student answer correctly

$P(A_{1})=p \\P(A_{2})=1-p \\P(B|A_{1})=1 \\P(B|A_{2})=\frac{1}{m} \\P(B)= P(A_{1})P(B|A_{1}) + P(A_{2})P(B|A_{2})= p+\frac{1-p}{m} \\$

P(B|A₁) means the probability that the answer is correct when he knew the answer

P(B|A₂) means the probability that the answer is correct when he guessed the answer

P(A₁|B) means the probability that he knew the answer when the answer was correct

Replacing everything in the Bayes' theorem you get:

$P(A_{1}|B)= \frac{P(B|A_{1})P(A_{1})}{P(B)}=\frac{(1)(p)}{p+\frac{1-p}{m}} =\frac{mp}{mp+1-p} =\frac{mp}{1+p(m-1)}$

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3 years ago

The lengths of the sides of a triangle are in the extended ratio 5:8:9. The perimeter of the triangle is 88 cm. What are the len

Nutka1998 [239]

Answer:

Step-by-step explanation:

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2 years ago

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ankoles [38]

Answer:

3.5(1.6 + 4.6 - 8.5) - 9.75
= 3.5(-2.3) - 9.75
= -8.05 - 9.75
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Step-by-step explanation:

1.6 + 4.6 - 8.5 = -2.3
3.5(-2.3) = 3.5 × -2.3 = -8.05
-8.05 - 9.75 = -17.8

I hope this helps!

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