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3 years ago

The are of a rectangle is 259cm2 and its length is 18.5 cm .Find its breath

Mathematics

1 answer:

Hoochie [10]3 years ago

5 0

Answer:

A=L×B

259=18.5×B

295=18.5B

295/18.5=18.5B/18.5

8.595=B

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What is the value of 4 in the number 745?

Nadya [2.5K]

<span>We need to find the value of 4 in the given number which is 745:
To be able to get the value of 4, we need to get familiar to each digit’s place value.</span> <span>=> Let us give the value of each digit first.
=> 5 = placed in one’s value
=> 4 = placed in tens value
=> 7 = placed in hundreds value

Thus,
=> 745 = 700 + 40 + 5

Therefore the value of 4 in 745 is tens or 40.

</span>

4 0

3 years ago

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proporti

Ksenya-84 [330]

Answer:

We need a sample size of at least 369.

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 $1 - \frac{\alpha}{2}$ .

The margin of error is:

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

For this problem, we have that:

$\pi = 0.32$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

How large of a sample size is required?

We need a sample size of at least n.

n is found when $M = 0.04$ . So

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

$0.04 = 1.645\sqrt{\frac{0.32*0.68}{n}}$

$0.04\sqrt{n} = 1.645\sqrt{0.32*0.68}$

$\sqrt{n} = \frac{1.645\sqrt{0.32*0.68}}{0.04}$

$(\sqrt{n})^{2} = (\frac{1.645\sqrt{0.32*0.68}}{0.04})^{2}$

$n = 368.02$

Rounding up

We need a sample size of at least 369.

5 0

4 years ago

Find the value of x. *

Ludmilka [50]

Answer:

13x + 7 + 4x + 15 = 90

17x + 22 = 90

17x = 68

x = 4

4(4) + 15= 16 + 15= 31

13(4) + 7 = 52 + 7 = 59

Step-by-step explanation:

6 0

4 years ago

Please answer! ill give you brainliest :)

Levart [38]

Answer:

answer what?

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Write the equation of a line in slope-intercept form that is parallel to the given line and passes through the point (12,-25).

lina2011 [118]

Answer:

$m_1 = m_2 = \frac{1}{4}$

And then since the new equation have the following form:

$y = m_2 x +b$

We can use the point given (x=12, y = -25) in order to find the intercept with this equation:

$-25 = \frac{1}{4} (12) +b$

And solving for the intercept b we got:

$-25 = 3 +b$

We subtract in both sides 3 and we got:

$b = -25-3 = -28$

And our final equation who satisfy the condition given is:

$y= \frac{1}{4} x -28$

Step-by-step explanation:

For this case we have the following equation given:

$y = \frac{1}{4} x + 2$

And we want to find an equation of a line parallel to the given function and this case we need to satisfy this condition:

$m_1 = m_2 = \frac{1}{4}$

And then since the new equation have the following form:

$y = m_2 x +b$

We can use the point given (x=12, y = -25) in order to find the intercept with this equation:

$-25 = \frac{1}{4} (12) +b$

And solving for the intercept b we got:

$-25 = 3 +b$

We subtract in both sides 3 and we got:

$b = -25-3 = -28$

And our final equation who satisfy the condition given is:

$y= \frac{1}{4} x -28$

4 0

4 years ago