D is a function because there are no repeated x values
for example b is not a function because we have (0,-7) and (0,-9)
44-2x=x-10
subtract 44 from both sides
-2x= x-54
subtract x from both sides
-3x= -54
divide by -3
x= 18
square root of 18= 4.24
in radical form 3 square root of 2
hope this helps
ACUTE ANGLE.
this is because the angle is less than 90 degree and greater than 0 degree
