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3 years ago

Please answer quickly MARKING Brainliest

Mathematics

1 answer:

Ratling [72]3 years ago

3 0

Answer:

17/19

Step-by-step explanation:

There are 190 coats sold

There are 20 large navy so that means 190-20 = 170 that are not large navy

P ( not large navy) = number that are not large navy/ total

=170/190

=17/19

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Internet providers: In a survey of 935 homeowners with high-speed Internet, the average monthly cost of a high-speed Internet pl

BlackZzzverrR [31]

Answer:

68% of plans cost between $62.16 and $86.52.

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean: 74.34

Standard deviation: 12.18

Bell-shaped is the same as normally distributed.

Estimate the number of plans that cost between $62.16 and $86.52.

62.16 is one standard deviation below the mean.

86.52 is one standard deviation above the mean.

By the Empirical rule, 68% of the measures are within 1 standard deviation of the mean.

68% of plans cost between $62.16 and $86.52.

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3 years ago

Which of the following is a solution of z^5 = 1 + √3 i?

nordsb [41]

Answer:

Option 2 is right

Step-by-step explanation:

Given that

$z^5=1+\sqrt{3} i$

We can write this in polar form with modulus and radius

$|z^5|= \sqrt{1+3} =2\\tan of Angle t =\sqrt{3} \\$

Hence angle = 60 degrees and

$|z^5|= 2(cos60+isin60)$

Since we have got 5 roots for z, we can write 60, 420, 780, etc. with periods of 360

Using Demoivre theorem we get 5th root would be

5th root of 2 multiplied by 1/5 th of 60, 420, 780,....

$z= \sqrt[5]{2} (cos12+isin12)\\z=\sqrt[5]{2} (cos84+isin84)\\\\z=\sqrt[5]{2} (cos156+isin156)\\\\z=\sqrt[5]{2} (cos228+isin228)\\\\z=\sqrt[5]{2} (cos300+isin300)\\$

Out of these only 2nd option suits our answer

Hence answer is Option 2.

8 0

3 years ago

Find the area of a rectangle that has a length of 5x+1 and a width of 2x+3

pantera1 [17]

I could be wrong, but I'm pretty sure here the answer would be 10x^2 + 17x +3 would be the area since you have to multiply length and width. since these are expressions with no answers and no other numbers, we can't find x.

5 0

3 years ago

Graph this function:<br> y= 5x - 18

lutik1710 [3]

The graph is shown below.

5 0

3 years ago

One the day a child's birth, a parent deposite 30,000 in a trust fund that pays 5 percent interest, compounded continuously. Det

Ratling [72]

Answer:

$104,710.29

Step-by-step explanation:

The amount is given by ...

A = Pe^(rt)

where P is the principal invested at annual rate r for t years. Filling in the numbers, we get ...

A = 30000e^(.05·25) = 30000e^1.25 ≈ 104,710.29

The balance will be about $104,710.29 on the child's 25th birthday.

8 0

3 years ago