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3 years ago

I am thinking of a number

Mathematics

1 answer:

valkas [14]3 years ago

7 0

Answer:

1422

Step-by-step explanation:

calculated sooo yerp

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4 times 2 1/8 mixed number in simpileest form

Anuta_ua [19.1K]

Answer:

8.5

Step-by-step explanation:

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3 years ago

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A school held a jump-roping contest. Diego jumped rope for 20 minutes.

professor190 [17]

Answer:

Jada jumped 75% of what Diego jumped.

Step-by-step explanation:

75% of 20 is 15. So it is 75%.

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3 years ago

Solve the system of equations below by graphing them with a pencil and

Karo-lina-s [1.5K]

Answer:

X+5= -x-3

2x = 2

X=1

then y1 is 4

y2 is -1

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3 years ago

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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

What’s the inverse of f(x) = x + 2 ?

ArbitrLikvidat [17]

Answer:

Step-by-step explanation:

f(x) = x + 2.....change f(x) to y

y = x + 2....now switch x and y and solve for y

x = y + 2

x - 2 = y....change y to f-1(x)...represents an inverse

f-1(x) = x - 2 <== ur inverse

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3 years ago

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