I assume your "reasons" mean "roots" or "zeros"
if 3 is a root, plug x=3 in the equation, you can find n:
3²+(n-1)*3+6=0
3(n-1)=-15
n-1=-5
n=-4
Plug n=-4 in the original equation: x²-5x+6=0
factor: (x-3)(x-2)=0
x=3, which we already know
or x=2, which is the value of m+4
m+4=2
m=-2
Answer:

Step-by-step explanation:


Putting value of eq. 1 in the following:

Answer:
Like on a test if you get extra credit.
Step-by-step explanation:
Find the coordinates after dilation
Answer:
138.8 cm
Step-by-step explanation:
Angle I =180 - 89 - 38 = 53
Using sine law
i/sinI = k/sinK
180/sin53 = k/sin38
k = 138.76