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Otrada [13]
3 years ago
7

The diameter of the plate was 11 inches. Find its circumference to the nearest half

Mathematics
2 answers:
alexgriva [62]3 years ago
6 0
Circumference of a circle
C = 2 * pi * r
r would be 5.5
Thus 
C = 34.56 
alexgriva [62]3 years ago
6 0
34.5in, here I hope this helps, good luck
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Find three different irrational numbers between the rational numbers 0.13 and 0.14
drek231 [11]
In order to solve this problem easily you coin this method: Find the squares of 0.13 and 0.14. They are respectively 0.0169 and 0.0196. Irrational numbers are going to located between this interval, considering that we are not counting perfect squares. \sqrt{0.0168} ,  \sqrt{0.017} , \sqrt{0.0175} are the three possible answers. 
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3 years ago
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A music store buys instruments and then sells them for 30% more than they paid.
nasty-shy [4]

Answer:

$45.00 * 0.30 = $13.50

$45.00 - $13.50 = <em>$31.50</em>

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2 years ago
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If z = (5 + 12i) ÷ (3 + 4i), then |z| = _____.<br><br> 5/13<br> 1(2/3)<br> 2(3/5)<br> 3
Marta_Voda [28]
\dfrac{5+12i}{3+4i}=\dfrac{5+12i}{3+4i}\cdot\dfrac{3-4i}{3-4i}=\dfrac{15-20i+36i-49i^2}{3^2-(4i)^2}\\\\=\dfrac{15+16i+49}{9-16i^2}=\dfrac{64+16i}{9+16}=\dfrac{64+16i}{25}=2.56+0.64i


z=a+bi\\\\|z|=\sqrt{a^2+b^2}\\\\z=2.56+0.64i\to a=2.56;\ b=0.64\\\\|z|=\sqrt{2.56^2+0.64^2}=\sqrt{6.9632}=\sqrt{\dfrac{69632}{10000}}=\sqrt{\dfrac{4096\cdot17}{100}}\\\\=\dfrac{64\sqrt{17}}{100}=0.64\sqrt{17}\approx2.6=2\dfrac{3}{5}
3 0
3 years ago
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What is the vector sum of (7,5) and (13,-5)
kolezko [41]

The vector sum of  two vectors as (7,5) and (13,-5) is given by v_1+v_2=20i+0j which can be written in point form as  (20,0) .

<u>Step-by-step explanation:</u>

Here we have , two vectors as (7,5) and (13,-5) Which are represented as :

v_1=7i+5j\\v_2=13i-5j

Addition of vector is as same as normal addition of integers as :

⇒ v_1+v_2=7i+5j+(13i-5j)

⇒ v_1+v_2=(7+13)i+(5-5)j

⇒ v_1+v_2=20i+0j ,

where i & j are the unit vectors in direction x-axis and y-axis respectively.

The vector sum of  two vectors as (7,5) and (13,-5) is given by v_1+v_2=20i+0j which can be written in point form as  (20,0) .

3 0
3 years ago
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Dmitrij [34]

Answer:

85 percent

Step-by-step explanation:

68 out of 80 = 68/80

= 0.85, times 100

= 85 percent  

7 0
3 years ago
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