11.-1+4.3+-2.8
-11+12-16
-15
I think
Answer:

Step-by-step explanation:

Factor both the numerator and denominator

The
's cancel out
The equation in its simplest form is 
Hope this helps!
Answer:
y = x
Step-by-step explanation:
The inverse of f(x) = x is just y = x.
anything above 28
Step-by-step explanation:
Seven times 4 is 28, times any number is anything 28 and above