47.93 is the answer because multiplication and addition
Answer:
390.8 ft2 I think
Step-by-step explanation:
X=1 is the answer to your question
The awnser to 60 x 20 is: 120
THe problem is basically telling us: 
where P is the power disappated and V^2 is our voltage squared.

So, for the second example to find the power we simply have to plug k and our voltage back in, so: