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4 years ago

Find the product for each of the following(show the process, tiles, box, foil,ec.)

Mathematics

1 answer:

Eddi Din [679]4 years ago

3 0

a) (x + 3)( X + 5 )

x( x + 3 )+ 5 (x + 3 )

x square + 3 X + 5 x + 15

X square + 8 x + 15

b)( 3 x minus 2)( X + 4)

x (3 x - 2 )+ 4(3 X - 2 )

3 x square - 2 X + 12 x -8

3 X square + 10 x - 8

c)x(x - 7)

x square - 7 x

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Answer:

Step-by-step explanation:

42-21=21

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3 years ago

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suppose that incomes of families in Newport Harbor are normally distributed with a mean of $750,000 and a standard deviation of

denis23 [38]

Answer: 0.345

Step-by-step explanation:

Given : The incomes of families in Newport Harbor are normally distributed with Mean : $\mu=\$ 750,000$ and Standard deviation : $\sigma= $250,000$

Samples size : n=4

Let x be the random variable that represents the incomes of families in Newport Harbor.

The z-statistic :-

$z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

For x= $800,000

$z=\dfrac{800000-750000}{\dfrac{250000}{\sqrt{4}}}=0.4$

By using the standard normal distribution table , we have

The probability that the average income of these 4 families exceeds $800,000 :-

$P(x>80,000)=P(z>0.4)=1-P(z\leq0.4)\\\\=1-0.6554217=0.3445783\approx0.345$

Hence, the probability that the average income of these 4 families exceeds $800,000 =0.345

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4 years ago

23. ANALYZING EQUATIONS

tamaranim1 [39]

Answer:

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3 years ago

I need some help with these questions

Ymorist [56]

The Answer is 8. B 18 is D

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4 years ago

Whats the answer???

Novay_Z [31]

X is -7. :)

Hope that helped :)

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