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3 years ago

A. Find and explain the error in the work shown.

Mathematics

1 answer:

gtnhenbr [62]3 years ago

3 0

Well, first they're assuming that the m<ABC = 90

The value of m<ABC is not given, so they aren't allowed to make up values based on the way the picture looks.

It is given that BD bisects <ABC, which means it splits the angle evenly..

Giving this equation: (x-5) = (2x-6)

Solving for x

-5 + 6 = 2x - x

1 = x

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If s ( x ) = 2 - x² and t ( x ) = 3x, what is s ( t ( -7 ) )?

soldi70 [24.7K]

Answer:

- 439

Step-by-step explanation:

s ( x ) = 2 - x²
t ( x ) = 3x
s ( t ( -7 ) ) = ?

--------------------------

t (-7) = 3 * ( -7 ) = -21
s ( t ( -7 ) ) = s ( -21 ) = 2 - ( -21 )² = 2 - 441 = - 439
s ( t ( -7 ) ) = -439

5 0

3 years ago

Solve 2x-y > 1 for y

ra1l [238]

The correct answer is 2x-1

4 0

3 years ago

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Genrish500 [490]

You know that it's a bot when it says "explanation in file".

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8 0

3 years ago

a major metroplitan newspaper selected a simple random sample of 1,600 readers from their list of 100,000 subscribers. they aske

Arisa [49]

Answer:

The 99% confidence interval for the proportion of readers who would like more coverage of local news is (0.3685, 0.4315).

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:

$n = 1600, \pi = 0.4$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.4 - 2.575\sqrt{\frac{0.4*0.6}{1600}} = 0.3685$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.4 + 2.575\sqrt{\frac{0.4*0.6}{1600}} = 0.4315$

The 99% confidence interval for the proportion of readers who would like more coverage of local news is (0.3685, 0.4315).

7 0

3 years ago

The area of fort worth is 139.1 square miles greater than the area of denver. the area of denver is 67.7 square miles greater th

cluponka [151]

292.5-139.1=153.4
153.4-67.7=85.7
Area of honolulu is 85.7 square miles.

4 0

3 years ago