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4 years ago

Help me pls I need help plasassssssssssssss

Mathematics

2 answers:

jolli1 [7]4 years ago

8 0

Answer:

6 hours

Step-by-step explanation:

vfiekz [6]4 years ago

4 0

Answer:

6 Hours

Step-by-step explanation:

First you want to know how many hours it will take to get to 440 miles

Then figure it out in fractions which would be 4/4

then half it to make it easier so 220 = 2/4 then the equation asks on how to get 3/4 well whats the even number between the 2 fractions

and the answers to the miles are

440 miles = 8 hours

220 miles = 4 hours

so then 330 miles = 6 hours

so 6 hours is the answer

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I need helpppppppppp!!!!!!!!!!

Genrish500 [490]

Answer:

m MN = 70°

Step-by-step explanation:

∠MLN is an angle formed by the chords ML and LN and is calculated as

∠MLN = 0.5( m arc MN ), that is

35° = 0.5 arc MN ( multiply both sides by 2 )

arc MN = 2 × 35° = 70°

4 0

3 years ago

What is a negative number minus a negative number?

SVETLANKA909090 [29]

Answer:

$-x-(-y) = y-x$

Step-by-step explanation:

lets say you have two negative numbers, -x and -y (x and y are positive).

$-x-(-y) = y-x$

8 0

3 years ago

Read 2 more answers

Reading proficiency: An educator wants to construct a 99.5% confidence interval for the proportion of elementary school children

Shkiper50 [21]

Answer:

A sample size of 345 is needed so that the confidence interval will have a margin of error of 0.07

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 of the interval is given by:

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

In this problem, we have that:

$p = 0.69$

99.5% confidence level

So $\alpha = 0.005$ , z is the value of Z that has a pvalue of $1 - \frac{0.005}{2} = 0.9975$ , so $Z = 2.81$ .

Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.07?

This is n when M = 0.07. So

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

$0.07 = 2.81\sqrt{\frac{0.69*0.31}{n}}$

$0.07\sqrt{n} = 1.2996$

$\sqrt{n} = \frac{1.2996}{0.07}$

$\sqrt{n} = 18.5658$

$(\sqrt{n})^{2} = (18.5658)^{2}$

$n = 345$

A sample size of 345 is needed so that the confidence interval will have a margin of error of 0.07

4 0

3 years ago

What is the diameter in the circle above 7 3.5 14 3.14

ira [324]

Answer:

Step-by-step explanation:

The diameter is the length from one point on the circle to another, passing through the center. The radius is the length from a point on the circle to its center, so we can always find the diameter by doubling the radius. In this case, with a radius of 7, our diameter is 7 · 2 = 14

5 0

3 years ago

a) find center of mass of a solid of constant density bounded below by the paraboloid z=x^2+y^2 and above by the plane z=4.(b) F

slava [35]

Answer: x-bar = y-bar = 0 whereas z-bar = 8/3

M= (c^2)/8 which is intern equal to 2 $\sqrt{2}$