A4 means the 4th number so it would be 17.
The answer is 42.80 , 2.28 is what they saved and i got the .80 cents because i rounded up from .78
Answer:
The simplified expressions are (<em>x</em> + <em>y·</em>z' + <em>t</em>) and <em>x·</em>(<em>x</em> + <em>y</em>' + <em>z</em>) respectively.
Step-by-step explanation:
The expressions provided are:

(i)
Simplify the first expression with as few symbols as possible:


(ii)
Simplify the second expression with as few symbols as possible:


Thus, the simplified expressions are (<em>x</em> + <em>y·</em>z' + <em>t</em>) and <em>x·</em>(<em>x</em> + <em>y</em>' + <em>z</em>) respectively.
-4/3 x (-3/4)x > -4/3 x (-6)
x > 4 x 2
x > 8