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3 years ago

|-4| + |-5| i need help!!!

Mathematics

2 answers:

iren2701 [21]3 years ago

4 0

Answer:

Step-by-step explanation:

The absolute value of any number is just its distance from 0.

-4 is 4 away from 0, so its absolute value is 4.

-5 is 5 away from 0, so its absolute value is 5.

Therefore, the equation is basically just asking what is 4 + 5, which is 9 :D.

Aneli [31]3 years ago

3 0

Answer:

Step-by-step explanation:

The bars around the two numbers imply that it wants you to find the absolute value. Absolute value is the distance a number is from zero since distance is always positive to find the answer just make the number positive. Following this rule l-4l=4 and l-5l=5. Then add them together 4+5=9.

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What are the x- and y-coordinates of point P on the directed line segment from A to B such that P is 1/3 the length of the line

Galina-37 [17]

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5 0

3 years ago

4/5p - 3/5p - 4 = 0 <br><br> And I need to write out my work

sdas [7]

9514 1404 393

Answer:

p = 20

Step-by-step explanation:

Collecting terms gives ...

(4/5 -3/5)p - 4 = 0

1/5p - 4 = 0

Multiplying by 5, we get ...

p - 20 = 0

Then, adding 20 gives the solution:

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3 years ago

Of 1000 randomly selected cases of lung cancer, 823 resulted in death within 10 years.

Arada [10]

Answer:

a) $0.823 - 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.799$

$0.823 + 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.847$

The 95% confidence interval would be given by (0.799;0.847)

b) $n=\frac{0.823(1-0.823)}{(\frac{0.03}{1.96})^2}=621.79$

And rounded up we have that n=622

c) $n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

Step-by-step explanation:

Part a

$\hat p=\frac{823}{1000}=0.823$

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by: