Using the periodic table and your knowledge of atomic structure. compare the number of electrons in a carbon-12 and carbon-14 isotope.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

blue

light-years

magnitude