Answer:
The SI system , also called theatrics system, is used around the world
d. oligomer it is the correct answer also if you would just search that up it pops up
A
Explanation:
Its an acid.
+3
NH₄F
=> N + 4H + F = 0
=> N + 4(+1) + 1(-7) = 0
=> N = 7 - 4 = +3
