Question # 1
Answer:

Step-by-step explanation:
Given the expression

∵ 
∵ 








Therefore,

Question # 2
Answer:

Step-by-step explanation:
Given

∵ 
∵ 










Therefore,

Answer:
-1
Step-by-step explanation:
1x= -1
x= -1
80% = $56
1% = $56/80 = $70
100% = $70 * 100 = $700
Original price = $700
Hope this helps.
:-)