Which mineral is never found freely in nature but is extracted from a chemical
compound?
O
O
A. Salt
B. Coal
O
O
c. Silicon
D. Gold
SUBMIT

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.

: -)

the answer would be d : p

want or the answer