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2 years ago

BRAINLIST ASAP

Mathematics

1 answer:

kifflom [539]2 years ago

6 0

Answer:

25.50

Step-by-step explanation:

-5 notebooks $2 each

-4 pencils $1.50 each

-2 packs of markers $3.75 each

5(2)+4(1.50)+2(3.75)

$23.5

23.5 times 8.5/100

1.9975

plus 23.5

25.4975

rounded to 25.50

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Answer:

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Part b) The volume of the plastic is $V=386.45\ cm^{3}$

Step-by-step explanation:

we know that

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step 1

Find the volume of the complete ball (air +plastic)

we have

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substitute

$V=\frac{4}{3}\pi (12.5)^{3}$

$V=8,181.23\ cm^{3}$

step 2

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we have that

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The radius of the interior of the ball is

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substitute

$V=\frac{4}{3}\pi (12.3)^{3}$

$V=7,794.78\ cm^{3}$ -----> this is the volume of the air (interior of the ball)

step 3

Find the volume of the plastic

we know that

The volume of the plastic is equal to the volume of the complete ball minus the volume of the air

$8,181.23\ cm^{3}-7,794.78\ cm^{3}=386.45\ cm^{3}$

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