180.
4•9=36, and 36•9 is 324. 4•3 is 12, while 12•12 is 144.
324 - 144 = 180. I hope this helps!
Answer:
Maximum revenue = 1000 thousands of dollars.
Explanation:
We have the revenue equation
, where x is measured in thousands of toys produced, and r(x) is measured in thousands of dollars.
At maximum revenue the derivative of equation is zero
So, 
So maximum revenue is when 200 thousands of toys are produced.
Maximum revenue, 
Maximum revenue = 1000 thousands of dollars.
The scientific notation is 37.5×10^-6