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andrew-mc [135]
2 years ago
6

13) A ball is dropped from a height of 64 feet.

Mathematics
1 answer:
zalisa [80]2 years ago
6 0

Answer:

85

Step-by-step explanation:

64+16+4+1= 85 is the total distance i believe

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Nx-5= -0.4<br> What is N?
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\large\boxed{n=\dfrac{4.6}{x}}

Step-by-step explanation:

nx-5=-0.4\qquad\text{add 5 to both sides}\\\\nx-5+5=-0.4+5\\\\nx=4.6\qquad\text{divide both sides by}\ x\neq0\\\\\dfrac{nx}{x}=\dfrac{4.6}{x}\\\\n=\dfrac{4.6}{x}

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A circle with the diameter of 40 inches. what is the area?
Vsevolod [243]

Answer:

<em>A= 1256</em>

Step-by-step explanation:

<u>The formula for area of a circle is </u>A=\pi r^{2}

1. Diameter is DOUBLE of radius, so the diameter must be divided by 2. <em>40/2 = 20. </em>

<em>2. </em>Then, plug in the values into the area formula. <em>A= 3.14</em>(20^{2})

3. Solve.<em> A= 1256</em>. (Remember that 20 squared is <em>20x20</em>)

7 0
3 years ago
. Compute the required sample size given the required confidence in the sample results is 99.74% (Z score of 3). The level of al
Shtirlitz [24]

Answer:

900 sample size

Step-by-step explanation:

To determine the sample size for a proportion, the margin of error formula is used to determine this:

E=Z_{\frac{\alpha}{2} }*\sqrt{\frac{\hat p \hat q}{{n} }

n=\hat p \hat q*(\frac{Z_{\frac{\alpha}{2} }}{E} )^2

Where p is the proportion, E is the margin of error, n is the sample size, q = 1 - p, Z_\frac{\alpha }{2} is the z score.

Since the proportion is not known, the sample size needed to guarantee the confidence interval and error is at p = 0.5 and q = 1 - p = 1 - 0.5 = 0.5

E = 5% = 0.05, Z_\frac{\alpha }{2} = 3. Hence:

n=0.5*0.5*(\frac{3}{0.05} )^2\\\\n = 900

6 0
3 years ago
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