Answer:
Step-by-step explanation:
a)
Smallest number of equations required are:

Let equations are

b)
Yes we can add one more equation
c)
We can add infinite such equations so that solution remains same.
d)
General form of such equations are called inconsistent equations
Answer:
C 180-123
Step-by-step explanation:
This is because 180 is what triangles always equal and if one angle is 128 then the rest will be answered from this equation
The answer is 4.5, I hope this helps.

---------------------------------------------------------
Take away 1 from both sides
---------------------------------------------------------

---------------------------------------------------------
Evaluate the value on the right
---------------------------------------------------------

----------------------------------------------------------
Multiply by 15 on both side
---------------------------------------------------------

---------------------------------------------------------
Evaluate
---------------------------------------------------------

---------------------------------------------------------
Divide by 6 on both sides
---------------------------------------------------------

---------------------------------------------------------
Simplify
---------------------------------------------------------

So 9 x 16 =?? So u have to times those and u should get the answer