Answer: I think It's D
Step-by-step explanation: Comment if im right or wrong please
is the determinant of the coefficient matrix:

is the determinant of the coefficient matrix, but this time you replace the
-coefficients with the values on the right hand side of the equations:

Answer:
Option B. 
Step-by-step explanation:
we know that
The probability that the dart will land in the section labeled with a X is equal to divide the area of the smaller green circle by the total area
so

X+23<-57
x<-80
x is less than -80.
Hope this helps.