Answer:
a)
,
, b)
,
, 
Step-by-step explanation:
a) The values of the output for steady-state operation are:




b) The formula for linearization is:

The first derivative of the formula evaluated at x = 1 is:


The linearized model is:

The output at x = 2 is presented below:


Linearized model offers reasonable approximations for small intervals.
Solve for y like the top equation:
2y = -4ax + 11
2y/2 = -4ax/2 + 11/2
y = -2ax + 11/2
In a division problem, ...
... dividend / divisor = quotient
Multiplying both sides of this equation by "divisor", we get ...
... dividend = quotient × divisor . . . . . . . . the desired relationship
The for dividend = 1/8, divisor = 6, and quotient = 1/48, this becomes ...
... 1/8 = 1/48 × 6
... 1/8 = 6/48 = 1/8 . . . . . the given values are consistent
I don’t know if this is right or not but m < ABD + m < BDC = 90