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2 years ago

-(-3x-5)=7x what is x

Mathematics

2 answers:

Volgvan2 years ago

6 0

Answer: 5/4

Step-by-step explanation:

konstantin123 [22]2 years ago

5 0

Step-by-step explanation:

-(-3x-5)=7x

3x+5=7x

4x=5

x=5/4

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In a certain city of several million people, 7.7% of the adults are unemployed. If a random sample of 300 adults in this city is

Lilit [14]

Answer: 0.2643

Step-by-step explanation:

Given : The proportion of adults are unemployed : p=0.077

The sample size = 300

By suing normal approximation to the binomial , we have

$\mu=np=300\times0.077=23.1$

$\sigma=\sqrt{np(1-p)}=\sqrt{300\times0.077(1-0.077)}\\\\=4.61749932323\approx4.62$

Now, using formula $z=\dfrac{x-\mu}{\sigma}$ , the z-value corresponding to 26 will be :-

$z=\dfrac{26-23.1}{4.62}\approx0.63$

Using standard distribution table for z , we have

P-value= $P(z\geq0.63)=1-P(z$

$=1-0.7356527=0.2643473\approx0.2643$

Hence, the probability that at least 26 in the sample are unemployed =0.2643

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2 years ago

Tyler has 2 dogs and 7 fish. What is Tyler's ratio of fish to dogs?

sergij07 [2.7K]

Answer:

2:7

Step-by-step explanation:

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2 years ago

Read 2 more answers

Question 3

Crank

Step-by-step explanation:

Given that,

The mass of a patient = 70 kg

A 70kg patient has approximately 8 pints of blood.

The patient donates 470mL of blood.

We know that,

1 pint = 568 mL

8 pints = 4544 mL

Required fraction,

$\dfrac{470}{4544}=0.1\\\\=\dfrac{1}{10}$

So, the required fraction is approximately $\dfrac{1}{10}$ .

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2 years ago

-(-3x-5)=7x what is x​

-(-3x-5)=7x what is x