<h3>
Answer:</h3>

<h3>
Step-by-step explanation:</h3>
We know that
, so substitute that into the equation. 
With negative powers, instead of making the result negative, you divide one by it. Mathematically speaking,
. This makes our equation: 
Finally, simplify the exponent. 
20% of 89.75 is 17.95

so :

the Trina's coupon will subtract the answer by 10%:
10%of 71.8 is 7.18

so the final answer is:

she has to pay $64.62
hope this helps
Answer:

Step-by-step explanation:
We have to simplify the following expression as given by

= 
=
( Answer )
Because, we know that
and 
If we consider
and
,
then 
Answer:
b=
−3
/x
Step-by-step explanation:
Step 1: Add -10 to both sides.
−2bx+10+−10=16+−10
−2bx=6
Step 2: Divide both sides by -2x.
−2bx
−2x
=
6
−2x
b=
−3
/x