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3 years ago

7

I NEED HELP WITH MATHQuestion: (In the pic)

1 answer:

storchak [24]3 years ago

8 0

Inequality, because want to know when we'll make a profit.
$d (- 680+ 960) \geqslant 52000 \\ 280d \geqslant 52000$
Profit: Let's See When 280d equals 52000

$d \geqslant \frac{52000}{280} \\ d \geqslant 185.71$
So, after 190 days Julianne will make a profit
$280(190) \geqslant 52000 \\ 53200$

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zysi [14]

Answer:

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Step-by-step explanation:

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3 years ago

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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3 years ago

the room to be covered is rectangular in shape with a width of 20 ft and a length of 28 ft .what is the area of room to be cover

kiruha [24]

A=L×W
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A=560ft.

5 0

3 years ago

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Answer:

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Step-by-step explanation:

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Which expressions are equivelent to 3 1/4 - (-5/8)

sertanlavr [38]

Answer:

<em>Fraction form=31/8 Decimal form=3.875 </em>

Step-by-step explanation:

<em>Convert the mixed numbers to improper fractions, then find the Least common denominator and combine</em>

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3 years ago