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3 years ago

Z score that corresponds to a 99 % confidence level

Mathematics

2 answers:

Sergio [31]3 years ago

8 0

Is this a question or...?

Black_prince [1.1K]3 years ago

6 0

Huh what’s that mean

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What is 4x8 please answer I’ll give you 95 points

Rina8888 [55]

Answer:

Step-by-step explanation:

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3 years ago

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A competitive knitter is knitting a circular place mat. The radius of the mat is given by the formula

Ilia_Sergeevich [38]

Answer: A. $A'(t)=\frac{4356\pi}{(t+11)^{3}}-\frac{527076\pi}{(t+11)^{5}}$

B. A'(5) = 1.76 cm/s

Step-by-step explanation: Rate of change measures the slope of a curve at a certain instant, therefore, rate is the derivative.

A. Area of a circle is given by

$A=\pi.r^{2}$

So to find the rate of the area:

$\frac{dA}{dt}=\frac{dA}{dr}.\frac{dr}{dt}$

$\frac{dA}{dr} =2.\pi.r$

Using $r(t)=3-\frac{363}{(t+11)^{2}}$

$\frac{dr}{dt}=\frac{726}{(t+11)^{3}}$

Then

$\frac{dA}{dt}=2.\pi.r.[\frac{726}{(t+11)^{3}}]$

$\frac{dA}{dt}=2.\pi.[3-\frac{363}{(t+11)^{2}}].\frac{726}{(t+11)^{3}}$

Multipying and simplifying:

$\frac{dA}{dt}=\frac{4356\pi}{(t+11)^{3}} -\frac{527076\pi}{(t+11)^{5}}$

The rate at which the area is increasing is given by expression $A'(t)=\frac{4356\pi}{(t+11)^{3}} -\frac{527076\pi}{(t+11)^{5}}$ .

B. At t = 5, rate is:

$A'(5)=\frac{4356\pi}{(5+11)^{3}} -\frac{527076\pi}{(5+11)^{5}}$

$A'(5)=\frac{4356\pi}{4096} -\frac{527076\pi}{1048576}$

$A'(5)=\frac{2408693760\pi}{4294967296}$

$A'(5)=1.76268$

At 5 seconds, the area is expanded at a rate of 1.76 cm/s.

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3 years ago

Help me pls I kind of confused

Sunny_sXe [5.5K]

Ok so basically you have to anahajahabdbnxnxkskalakand

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6 gentlemen and 4 ladies, a committee of 5 is to be formed. In how many ways can this

professor190 [17]

2 men and 3 women
3 men and 2 women
4 men and 1 women
5 men and 0 women
(Total of 4 ways)

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3 years ago

If a plane is traveling 300 mph, how long will it take to travel 1800 miles

levacccp [35]

If you do 1800 divided by 300, the answer is 6 hours.

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