Answer:
Step-by-step explanation:
Given


The given system is
can be represented by

The given system is consistent when determinant of A is not equal to zero



i.e. system is consistent for all value of k except 

18.90? I believe would be the answer . Let's see if someone else responds
This should help!! Thanks! Let me know!
40 ft of 60% (.6) = 24ft
Area- 24(40)=960ft
You need to figure out how many square feet one paint can will be able to paint, then take the 24 square feet and divide it by the how much the paint can can paint, then you’ll have how many paint cans you need