Answer:
25%
Step-by-step explanation:
Simply simplify:
7a³(7a²)-4a^6 ⇒ 49a^6 - 4a^6 ⇒ 45a^6
Hope that helps!
Answer:
With base of 3: 
With base of 9: 
Step-by-step explanation:
Use 3 and 9 as the base of the power.

Answer:
the radius will be 9 or b
Step-by-step explanation:
18 is the diameter so you divide by 2 to get the radius which will be 9.