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yulyashka [42]
3 years ago
6

In a 56 pound mixture of sand and gravel, 14 pound is gravel. How much gravel is there in a 1-pound mixture? ​ 445 ​ lb ​​ 313 l

b ​ 310 ​ lb ​​ ​ 524 ​ lb
Mathematics
1 answer:
Ivenika [448]3 years ago
7 0
Divide the amount of gravel in the 5/6 pound mixture:

1/4 / 5/6 = 1/4 * 6/5 = 6/20 = 3/10 pounds


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20% of what number is equal to 2/3 of 90?
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Let the number be x, then

1/5 * x = 2/3 * 90

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Suppose a large shipment of telephones contained 21% defectives. If a sample of size 498 is selected, what is the probability th
grandymaker [24]

Answer:

P(-3\% < x < 3\%) = 0.901

Step-by-step explanation:

Given

p = 21\%

n = 498

Required

P(-3\% < x < 3\%)

First, we calculate the z score

z = \sqrt{p * (1 - p)/n}

z = \sqrt{21\% * (1 - 21\%)/498}

z = \sqrt{21\% * (79\%)/498}

z = \sqrt{0.1659/498}

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z = 0.0182

So:

P(-3\% < x < 3\%) = P(-3\%/0.0182 < z

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P(-3\% < x < 3\%) = 0.901

6 0
3 years ago
Which circles have an area of 36pift2?
san4es73 [151]
Area=pi times radius^2
area=36pi
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divide both sides by pi
36=radius^2
square root both sides
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2radius=diameter
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radius=6
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the answers area A and D
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7 0
4 years ago
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