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3 years ago

Which is equivalent to 23·2-5? A) 2-15 B) 2-8 C) 2-2 D) 22

Mathematics

2 answers:

ddd [48]3 years ago

4 0

The answer is C. I just did the quiz and can confirm it is. :D

MaRussiya [10]3 years ago

3 0

I'm pretty sure this answer is A or D
If not then I don't know it but I'll try to help you out

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According to a study, nearly 80% of workers in law libraries are satisfied with their job. Assume the true proportion of law l

Volgvan

Answer:

0.618

Step-by-step explanation:

This is a binomial distribution. We are to determine the probability of people unsatisfied. If we denote the probability of being satisfied with $q$ , then $q=0.8$ . Let $p$ be the probability of being unsatisfied. Then $p+q=1$

$p=1-q =1-0.8=0.2$

Since the random sample is 20 and $p$ is small enough, we can use the Poisson probability function

$P(X=x) = \dfrac{e^{-\lambda}\lambda^x}{x!}$

where $\lambda$ is the mean and is given by $\lambda=np=20\times0.2=4$ .

Denoting the probability of at most 4 unsatisfied with $P(x\le4)$ ,

$P(x\le4)=P(x=0)+P(x=1)+P(x=2)+P(x=3)+P(x=4)$

$P(x=0)= \dfrac{e^{-4}4^0}{0!} = e^{-4}$

$P(x=1)= \dfrac{e^{-4}4^1}{1!} = 4e^{-4}$

$P(x=2)= \dfrac{e^{-4}4^2}{2!} = 8e^{-4}$

$P(x=3)= \dfrac{e^{-4}4^3}{3!} = e^{-4}\dfrac{32}{3}$

$P(x=4)= \dfrac{e^{-4}4^4}{4!} = e^{-4}\dfrac{32}{3}$

$P(x\le4)=e^{-4}(1+4+8+\dfrac{32}{3}+\dfrac{32}{3})=0.018\times34.33 = 0.618$

8 0

4 years ago

This is a sat practice. need help <br>

nadya68 [22]

Answer:

The answer is A) -1 + 12i

Step-by-step explanation:

(7 + 3i) + (-8 + 9i)

(7 - 8) + (3 + 9)i

7 - 8 = - 1

3 + 9 = 12

- 1 + 12

4 0

3 years ago

Read 2 more answers

(-2)(-11)(-4) = ANSWER PLEASE

Mashcka [7]

Answer: -88

-2•-11•-4=-88

7 0

3 years ago

Read 2 more answers

Will give extra points an brainliest pleas help ASAP

Shkiper50 [21]

(7, 1) and (1,8)
slope = (8 - 1)/(1-7) = -7/6

so
y - 1 = -7/6(x - 7)
y - 1 = -7/6 x + 49/6
y = -7/6 x + 55/6

answer
A. first one

y = -7/6 x + 55/6

4 0

4 years ago

Jason wrote this expression to describe the total amount he will spend on a magazine and a book.

kati45 [8]

The 11 may represent the price of the magazine if all the magazines at a certain store are $11. Then the s may represent the price of a book because all the books at a bookstore are different prices.

Hope this helps

8 0

3 years ago

Read 2 more answers