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Anna007 [38]
3 years ago
13

A necklace contains twenty-four spherical beads of silver, each having a radius of 0.5cm. The beads are to be coated, and the co

st of coating is $10 per cm2. What is the approximate total cost, to the nearest cent, for coating the beads?
Mathematics
1 answer:
Inessa [10]3 years ago
4 0

Answer:

$153

Step-by-step explanation:

To find the total cost, we have to calculate the area of one bead, then all of them:

Area of one bead = pi x r^2 = 3.14 x 0.5^2 = 3.14 x 0.25 = 0.765cm^2

Area of 20 beads = 0.765 x 20 = 15.3cm^2

Now, we are able to calculate the ultimate cost of coating:

If the cost is $10 per cm^2, then we have to find how much it costs to coat 15.3 cm^2.

15.3 x 10 = $153.

Hope this helps

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Answer:

1.92%

Step-by-step explanation:

The probability for first case, picking a queen out of deck, will be:

\frac{4}{52}

as there will be 4 queens in a deck, one of each suit.

For the second pick, the probability of picking a diamond card, will be:

\frac{13}{52}

here the total will remain 52 as he has replaced the first card and not kept it aside and there will be 13 cards in diamond suit (including the three face cards).

Thus the net probability for both cases will be:

P = \frac{4}{52}  * \frac{13}{52}\\ P = \frac{1}{52}\\ P = 0.01923\\P = 1.923\%\\\\P = 1.92\%

Thus total probability for the combined two cases will be 1.92%

7 0
3 years ago
Ken borrowed $ 2000 from Sam at 8% per year.what is the simple interest after 6 years? A.$ 160 B.$ 960 C. $ 1,600 D. $ 9,600
Klio2033 [76]

Step-by-step explanation:

2000×8/100=160

160×6=960

7 0
3 years ago
A pound of poke cost $18.00 , how much will 3/8 of pound cost
Allushta [10]
$6.75 Because 3/8 x $18.00 is $6.75
8 0
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A video store charges $3 per movie, and the fourth movie is free. How much do you actually pay per movie?
Lynna [10]

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Step-by-step explanation:

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6 0
3 years ago
Read 2 more answers
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Savatey [412]
You would need the table to figure this problem out, but here we go!

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