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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

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?

blagie [28]

Let the number be x, then

1/5 * x = 2/3 * 90

1/5 x = 60

x = 60 * 5 = 300 (answer)

7 0

3 years ago

Hi! can anyone help me? Question is down in the picture below! 10 points! Thank you!

Bad White [126]

Answer:2

Step-by-step explanation:

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2 years ago

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3 years ago

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

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

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

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

$z = \sqrt{0.1659/498}$

$z = \sqrt{0.000333}$

$z = 0.0182$

So:

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

$P(-3\% < x < 3\%) = P(1.648 < z$

From z probability, we have:

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

6 0

3 years ago

Which circles have an area of 36pift2?

san4es73 [151]

Area=pi times radius^2
area=36pi
36pi=pi times radius^2
divide both sides by pi
36=radius^2
square root both sides
6=radius

2radius=diameter
2 times 6=12
radius=6
diamater=12

the answers area A and D
(if you know your radius and diameter, you would know that diameter is 2 times radius and you could eliminate 2 choices imedietly (B and C))

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4 years ago