100% = 1.00 is the cost of the jeans itself
6% = 0.06 is the sales tax to be added
let "cost of jeans" be represented by x
so you will get an expression
(1.00 + 0.06) x + 8.95 = Total Cost
Answer:
You just need to demonstrate that the expression is not equivalent. To do that, we just need to evaluate the expression with a specific number.

For
, we have

Notice that the answer is true because 2 is not equivalent to 5.
Therefore, the expression is actually non-equivalent.
Answer:
not really sure for number one
1. 1.56y × 3.9x
2. 4.8x + 9.6y