12(pi)
diameter is 4, so radius should be 2
closest height to equal 12(pi) would be 0.96
P should equal 3. hope this helps.
5a - 4a = -9 - 8a
a = -9 - 8a
9a = -9
a = -1
Grams
At least that is what we use in Mexico and in most Latin-American countries
