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4 years ago

PLEASE HELP!! can somebody please estimate what this equation would be or what the real answer would be!!! thank you

Mathematics

1 answer:

ICE Princess25 [194]4 years ago

7 0

Answer:

see below

Step-by-step explanation:

-2 1/4 * 7.89 + 13/3 ÷ (-4.17)

Estimate

Multiply and divide from left to right

-9/4 * 8 + 4 ÷ -4

-18 -1

-19

The exact answer is -18.79166.....

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Solve the following system of equations graphically.

Mrrafil [7]

Quadrant I because the point is (4,4)

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3 years ago

Im not shure how to do this

Ganezh [65]

c. 44/9

Step 1

Multiply the denominator by the whole number

9 × 4 = 36

Step 2

Add the answer from Step 1 to the numerator

36 + 8 = 44

Step 3

Write answer from Step 2 over the denominator

44/9

8 0

4 years ago

There are eleven songs on your playlist. five of them are country and six are pop. with random shuffle and no repetition, you li

jek_recluse [69]

The probability is 1/462.

To find this, we will find the number of combinations of 5 country songs taken 5 at a time, 6 pop songs taken 0 at a time, and the total number of outcomes will be 11 songs taken 5 at a time:

$\frac{_5C_5\times_6C_0}{_{11}C_5}
\\
\\\frac{\frac{5!}{5!0!}\times\frac{6!}{0!6!}}{\frac{11!}{5!6!}}=\frac{1\times1}{\frac{11!}{5!6!}}
\\
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3 0

4 years ago

What is the real part of the following complex number?<br> -3+ 2iV2

Marina86 [1]

Answer:

Option (3)

Step-by-step explanation:

If a complex number is in the form of (a + ib), real part of the complex number is 'a' and imaginary part is 'b'.

Given complex number is (-3 + 2i )

Comparing this number with (a + ib), real part of the number will be (-3) and imaginary part of the number will be 2.

Option (3) will be the answer.

3 0

3 years ago

An article regarding interracial dating and marriage recently appeared in the Washington Post. Of the 1,709 randomly selected ad

VMariaS [17]

Answer:

The 95% confidence interval for the percent of all black adults who would welcome a white person into their families is (0.8222, 0.8978).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

323 blacks, 86% of blacks said that they would welcome a white person into their families. This means that $n = 323, p = 0.86$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.86 - 1.96\sqrt{\frac{0.86*0.14}{323}} = 0.8222$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.86 + 1.96\sqrt{\frac{0.86*0.14}{323}} = 0.8978$

The 95% confidence interval for the percent of all black adults who would welcome a white person into their families is (0.8222, 0.8978).

5 0

4 years ago