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Neporo4naja [7]
3 years ago
5

I NEED HELP UNDERSTANDING BOTH OF THESE QUESTIONS

Mathematics
1 answer:
nikklg [1K]3 years ago
4 0

Answer:

For the first image: -0.4/9

Second Image = 1.53/0.45

Step-by-step explanation:

a + b = 1.6 - 2 = -0.4 (The symbols just make it stay negative)

2 - c = 2 - (-7) = 2 + 7 = 9

--------

2a - 1/3  =  2(-3/5) - 1/3  =  -1.2 -1/3  =  -1.5333

b/15  =  -6.75/15  =  -0.45

(The two negatives make it positive)

Hope this helps

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Consider a situation in which P(A) = 1/8, P(C) = 1/4, and P(A and B) = 1/12. What is P(B and C)?
V125BC [204]
ANSWER

P(B \: and \: C) =  \frac{1}{6}


EXPLANATION

Recall that,

P(A \: and \: B)=P(A) \times P(B)

But we were given that,

P(A)= \frac{1}{8}

and

P(A \: and \: B) =  \frac{1}{12}


We substitute these values into the above formula to obtain,


\frac{1}{12} = \frac{1}{8}  \times P(B)



This implies that,

\frac{1}{12}  \times 8=8 \times  \frac{1}{8}  \times P(B)



This simplifies to,

P(B) =  \frac{8}{12}


P(B) =  \frac{2}{3}


So we can now find
P(B \: and \: C).



We use the same formula again,

P(B \: and \: C) = P(B) \times P(C)
We substitute the values to get,


P(B \: and \: C) =  \frac{2}{3}  \times  \frac{1}{4}
We multiply out to get,


P(B \: and \: C) =  \frac{1}{6}


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