Question

Help please. @iGreen.

Answer 1

Janine inflated 1 ball to a radius of 18 cm and another ball to a radius of 12 cm. How much more air was in the larger ball?

Use 3.14 to approximate pi and enter your answer to two decimal places.


____cm^3

Answer 2

Use the volume of a sphere.

\(V = \dfrac{4}{3}\pi r^3\)

Plug in the radius:

\(V = \dfrac{4}{3} (3.14)(18^3)\)

Can you simplify that?

Answer 3

Quick thing (refreshing memory) 18^3 would be 18 times 18 times 18 right?

Answer 4

Yep, you got it.

Answer 5

(This is what i got) 4/3 = 1.3333, 18 x 18 x 18 = 5382

Answer 6

so 1.3333 x 3.14 x 5382? (Probably wrong)

Answer 7

wait

Answer 8

is it 18 cm^3 ?

Answer 9

@iGreen.

Answer 10

Yes, that's correct.

Answer 11

Multiply those 3

Answer 12

18 times 18 times 18 = 5382

Answer 13

Yes..now multiply:

1.3333333 * 3.14 * 5382

Answer 14

22532.6399

Answer 15

Yep! Now let's find the volume of the smaller one.

\(V = \dfrac{4}{3} \pi r^3\)

\(V = \dfrac{4}{3}(3.14)(12^3)\)

Simplify

Answer 16

12^3 = 1728

Answer 17

1.3333 x 3.14 x 1728

Answer 18

7234.55982

Answer 19

Nice work, now subtract:

22532.6399 - 7234.55982

Answer 20

18^3 = 22532.6399, 12^3 = 7234.55982

Answer 21

15298.0801

Answer 22

Yep, that's the difference.

Answer 23

so 15298.0801 is my answer?

Answer 24

@iGreen.

Answer 25

Yep,

Answer 26

Aight cool thanks