Answer:9 cm by 9cm
Step-by-step explanation: 3*3=9
Answer:
1
Step-by-step explanation:
Given :
divided by 
Now, it can be solving as:

Simplest form of given equation is 1
Answer: C, you are correct
Step-by-step explanation:
This doesn’t make any sense
R=-1/800(x^2-2400x)
use R'=0
R'=1/400x-300, 1/400x=300 => x=1200 critical point
take R(1200), we know its max bcuz of the orientation of R