What makes speed a compound unit is that it includes units for and a. velocity; time b. distance; time c. distance; velocity d. velocity; acceleration

the answer is B

Explanation:

Speed is in fact the the distance that something travels in time. Think about it, it makes sense, doesn't it? Speed is the amount of distance something achieves in a set amount of time.

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.

: -)