Me wizards of biology an example of a detritivore would be a. a cow eating grass b. a hawk capturing a mouse c. a colony of ants eating a grasshopper

None of these are examples of detritovore.  A cow eating grass is an example of herbivore.  A hawk capturing a mouse and ants eating a grasshopper are both examples of predation.  I suspect the answer they are looking for is C, but that would only be accurate if the grasshopper were already dead before the ants got to it.  Basically, detritovores are organisms that eat dead things.

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.

: -)

i think the answer is gold im not entirely sure