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4 years ago

Find the circumference of a circle with a Radius = 4 ft. Use 3.14 for it, and round to 2 decimal places.

Mathematics

2 answers:

Readme [11.4K]4 years ago

5 0

Answer:25.12

Step-by-step explanation:

formula is d(pi)

so 8(3.14)

25.12

Mazyrski [523]4 years ago

3 0

Answer:

Circumference would be 25.12ft

Step-by-step explanation:

So circumference formula is pi(diameter)

We know the radius so to find the diameter we multiply the radius by 2.

so 4(2)=8

and since pi is 3.14 then multiply 8(3.14)

youll get 25.12

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What is 3/4 x = 6 what is the value of x

olasank [31]

Answer:

Step-by-step explanation:

3/4x = 6 Multiply both sides by 4/3

4/3 * 3/4 x = 6*4/3 Combine

x = 6 * 4/3

x = 24/3

x = 8

6 0

4 years ago

A survey of shoppers is planned to determine what percentage use credit cards. prior surveys suggest 63% of shoppers use credit

Alona [7]

We would need a sample size of 560.

We first calculate the z-score associated. with this level of confidence:
Convert 95% to a decimal: 95% = 95/100 = 0.95
Subtract from 1: 1-0.95 = 0.05
Divide by 2: 0.05/2 = 0.025
Subtract from 1: 1-0.025 = 0.975

Using a z-table (http://www.z-table.com) we see that this is associated with a z-score of 1.96.

The margin of error, ME, is given by:
$ME=z*\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$

We want ME to be 4%; 4% = 4/100 = 0.04. Substituting this into our equation, as well as our proportion and z-score,
$0.04=1.96\sqrt{\frac{0.63(1-0.63)}{n}}
\\
\\\text{Dividing both sides by 1.96,}
\\
\\\frac{0.04}{1.96}=\sqrt{\frac{0.63(0.37)}{n}}
\\
\\\text{Squaring both sides,}
\\
\\(\frac{0.04}{1.96})^2=\frac{0.63(0.37)}{n}
\\
\\\text{Multiplying both sides by n,}
\\
\\n(\frac{0.04}{1.96})^2=0.63(0.37)
\\
\\n(\frac{0.04}{1.96})^2=0.2331
\\
\\\text{Isolating n,}
\\
\\n=\frac{0.2331}{(\frac{0.04}{1.96})^2}=559.67\approx560$

3 0

3 years ago

Simplify fully WITHOUT using a calculator (3√2 -12)(2√2+1)

natita [175]

Answer:

$33\sqrt{2} +12$

Step-by-step explanation:

$(3\sqrt{2} - 12)(2\sqrt{2} + 1)$

$6\sqrt{2} + 3\sqrt{2} -12(2\sqrt{2})+12$

$9\sqrt{2}+24\sqrt{2}+12$

$33\sqrt{2} +12$

6 0

3 years ago

Read 2 more answers

Solve using square roots 3x^2+25=73

seropon [69]

Heya !

Given expression -

$3 {x}^{2} + 25 = 73$

Subtracting 25 both sides ,

$3 {x}^{2} + 25 - 25 = 73 - 25 \\ \\ 3 {x}^{2} = 48$

Dividing by 3 on both sides ,

$\frac{3 {x}^{2} }{3} = \frac{48}{3} \\ \\ {x}^{2} = 16$

Therefore ,
$x = + \: 4 \: \: \: \: or \: \: - 4 \: \: \: \: \: \: \: Ans.$

4 0

4 years ago

You are allowed to eat at most 12 pieces of candy. You have already eaten 2. Write an inequality and solve to find how many more

I am Lyosha [343]

Answer:

One of the below.

Step-by-step explanation:

12-2=10 2+x=12

4 0

3 years ago