The cost of a space mission is roughly $60 million. what type of obstacle to space exploration does this represent?

just here for the other one bc they put up with u

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.

: -)

a metamorphic rock would be formed.