Monday

October 20, 2014

October 20, 2014

Posted by **lilman** on Sunday, April 29, 2012 at 11:15am.

1. What is the approximate volume of the sphere?

524 m³ (my choice)

1,000 m³

1,256 m³

1,570 m³

2. What is the approximate surface area of the sphere?

225 yd2

707 yd2

1,767 yd2 (my choice)

5,301 yd2

3. What is the approximate volume of the sphere if the surface area is 482.8 mm²?

998 mm³

1,126 mm³

2,042 mm ³

2,993 mm³

I don't understand this one.

4. What is the approximate surface area of the sphere?

342.3 km2

451.9 km2

903.4 km2

2,713 km2

Don't understand.

5. What is the approximate radius of a sphere whose volume is 1,349 cm³?

5.7 cm

6.9 cm

11 cm

14.7 cm

Don't understand.

- surface area and volume -
**Reiny**, Sunday, April 29, 2012 at 12:59pmyou are dealing with two equations

1. surface area of sphere = 4π r^2

2. volume of sphere = (4/3)π r^3

notice all you need is the radius.

Since we cannot see your diagrams, #1, and #2 cannot be checked

3. given 4πr^2 = 482.8

r^2 = 482.8/(4π) = 38.42

r= √38.42 = 6.198

volume = (4/3)πr^3 = 997.53 , looks like a)

4.

you must have the radius given to you, just plug into the formula

5.

(4/3)πr^3 = 1349

r^3 = 1349/((4/3)π) = 322.05

r= (322.05)^(1/3) , the cube root of 322.05

= 6.85 (looks like b) )

fractions are really just divisions

e.g. 3/4 = 3 ÷ 4 = .75

you calculator should have a key for π

for powers look for key such as y^{x}or a variation of that

to do 322.05^(1/3) I entered

322.05

y^{x}

(1/3)

=

to get 6.85447...

- surface area and volume -
**Hannah**, Monday, April 28, 2014 at 8:40amnumber 2 is wrong its b. 707 yd^2.

**Answer this Question**

**Related Questions**

Science - A drop of oil (volume 0.05cm3) is released from a medicine dropper on ...

geometry/algebra - I asked this question yesterday, and I'm trying to understand...

Calculus-Optimal Form: need help... please - Suppose you are designing a coffee ...

volume:ration - A worm has a diameter of 2.4cm and its length is upto 1.9M. a)...

mathematics - the pretty perfume company designed a new perfume bottle. The ...

Math - the pretty perfume company designed a new perfume bottle. The bottle is ...

Geometry - I need an example of two cereal boxes that have the same volume but ...

Biology - hello my teacher today during our Biology lesson said : Diffusion ...

geometry - I found the volume of six cubes to total 336 cubic inches. How do I ...

biology - Why is a large surface area : volume ratio needed for cells to ...