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3 years ago

I need help with this... 4 more than some number d. and 3 is less than X. and the others :(

Mathematics

1 answer:

Greeley [361]3 years ago

3 0

2) C: 4+d

3) A: x-3

4) C: 5(1-f)

I know that this is a few weeks late...

but hope this helps!

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Valerie, a member of the track team, runs 100 yards in 12 seconds. How fast is she moving in feet per minute?

Alchen [17]

Answer:

1500ft

Step-by-step explanation:

Ight so 60/12 is 5. So then you'd multiply 100 by 5 to get 500, therefore she is moving 500 yards per minute.

Then you'd obviously just convert that to feet which is 1500 feet.

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2 years ago

1: Is 5 / 3(1-x) Equivalent to 8-8x<br><br> 2: Is 2(6 - 3x) equivalent to 2(3x) +x?

iris [78.8K]

Answer:

1. no. 2.no

Step-by-step explanation:

1. $\frac{5}{3 - 3x}$

= (5\3) × (1/1-x)

but 8-8x = 8(1-x)

2. 2(6-3x) = 12-6x =6(2-x)

2(3x) + x= 6x +x = 7x

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2 years ago

Please do these thank you!!!!!!!!ASAP this is 7th grade math

yan [13]

1. 4,821 inches
2. Sorry couldn't solve it.
3. Height is 23.5 inches
4. The package can be shipped at special rate.

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2 years ago

Solve this equation 3+5/2x=1/2x-8

guajiro [1.7K]

Answer:

Step-by-step explanation:

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2 years ago

g A random sample of 100 students was taken. Eighty-five of the student in the sample experienced anxiety during the exam. We ar

BaLLatris [955]

Answer:

The test statistic is $z = 1.25$

Step-by-step explanation:

We are interested in determining whether or not the proportion of the student who experience anxiety during the exam is significantly more than 80%.

At the null hypothesis, we test if the proportion is 80%, that is:

$H_0: p = 0.8$

At the alternate hypothesis, we test if the proportion is more than 80%, that is:

$H_a: p > 0.8$

The test statistic is:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, $\sigma$ is the standard deviation and n is the size of the sample.

80% is tested at the null hypothesis:

This means that $\mu = 0.8, \sigma = \sqrt{0.2*0.8} = 0.4$

A random sample of 100 students was taken. Eighty-five of the student in the sample experienced anxiety during the exam.

This means that $n = 100, X = \frac{85}{100} = 0.85$

The test statistic is

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{0.85 - 0.8}{\frac{0.4}{\sqrt{10}}}$

$z = 1.25$

The test statistic is $z = 1.25$

4 0

2 years ago