What is your question?
(Please don report me, im just trying to help, really)
If theres supposed to be a picture, i dont see anything btw.
5 significant figures but note that 0 is only non-significant when it begins a decimal its only significant when it's in between numbers or after a number
Answer:

Step-by-step explanation:
So, for 60 square feet they charge = 287
So, for 1 square foot they charge = 
If they charge the installation fee this becomes = 
We can write an equation to calculate cost by using this 
Where x is the amount of square foot
Answer:
-21
Step-by-step explanation:
I assume this is a 2 by 2 matrix.

determinant = -5 * 4 - 1 * 1 = -20 - 1 = -21