Can someone please help me I really need help with this

Answer:
[tex]21f^{2} g^{4} h^{6[/tex]
Step-by-step explanation:
The given expression is 7fgh*3fg^3h^5
We can multiply the numbers together first to get:
21fghfg^3h^5
Keep in mind this rule:
n^a*n^b=n^a+b
That said, we can simplify it fairly easily:
21f^2g^4h^6
Or:
[tex]21f^{2} g^{4} h^{6[/tex]