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Tpy6a [65]
4 years ago
11

Lisa made 2 identical necklaces, each having beads and a pendant. The total cost of the beads and pendants for both necklaces wa

s $15.40 . If the beads cost $3.80 for each necklace, how much did each pendant cost?
Mathematics
2 answers:
Gemiola [76]4 years ago
8 0
2 necklaces x $3.80 for each bead
$7.60
15.40 - 7.60
7.80
7.80 divide by 2
$3.90 for each pendant 
Vlad [161]4 years ago
6 0
Divide by 2 you'll get 3.90
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A cone shaped paper water cup has a height of 12 cm and a radius of 6 cm. If the cup is filled with water to half its height, wh
monitta

Answer:

The portion of the volume of the cup that is filled with water is \frac{1}{8}

Step-by-step explanation:

step 1

Find the volume of the paper water cup

The volume of the cone is equal to

V=\frac{1}{3}\pi r^{2}h

we have

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h=12\ cm

substitute

V=\frac{1}{3}\pi (6)^{2}(12)

V=144\pi\ cm^{3}

step 2

If the cup is filled with water to half its height, find out what portion of the volume of the cup is filled with water

Remember that

If two figures are similar, then the ratio of its volumes is equal to the scale factor elevated to the cube

In this problem the similar cone has half the height of the complete cone

so

The scale factor is equal to 1/2

therefore

The volume of the cup that is filled with water is equal to the volume of the complete cup by the scale factor elevated to the cube

V=(1/2)^{3}(144\pi)=(1/8)144\pi\ cm^{3}

therefore

The portion of the volume of the cup that is filled with water is

\frac{1}{8}

8 0
3 years ago
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What is the probability that 4 randomly selected people all have different birthdays? Ignore leap years, and round your final an
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Answer:

(D)0.9836

Step-by-step explanation:

There are 365 days in a year.

Since each person has a different birthday:

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  • We can choose a birthday for the third person 363 out of 365 days.
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Therefore,

P(4 randomly selected people all have different birthdays)

=\dfrac{365}{365} \times \dfrac{364}{365} \times \dfrac{363}{365} \times \dfrac{362}{365}\\\\=0.9836

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Answer:

The diagonal * the other diagonal, all divided by two.

Step-by-step explanation:

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