Physics
posted by Yulia .
What is the volume in cubic cm of a sphere with radius 2 cm?
is it =
33.51032163829112
What is the area in m2 of a triangle with base 2.8 m and height of 10.4 m?
is it =
14.56
A sphere has a volume of 106 cm3. What is its radius (in cm)?
is it =
101.8112097952136
that doesnt look right :/

yes. Unless you have to worry about significant digits.
yes, but I wonder if you should be paying attention to sig digits.
No.
radius=cuberoot (3*volume/(4PI)) 
The first two are OK. For the third question, use
R^3 = [3/(4 pi)]*V
and then take the cube root 
To get cube root on a calculator, use the y^{x} key
as
NUMBER y^{x} (1/3) =
That give you the cube root of NUMBER 
Yes, I do have to be paying attention to sig figs, just for this chapter though
and for the third one, is it 6.297560287884612?