Answer:
B₃H₄
Step-by-step explanation:
This is a covalent compound, therefore we use the prefixes in front of the words to know how many of each atom there are. Triboron means there are 3 boron atoms. Tetra means four, and hydride is just the suffix form of hydrogen. So there are 3 boron atoms and 4 hydrogen atoms to make B₃H₄