100-69.78=30.22-26.73=3.49 the sales tax is 3.49
Answer:
x=9,-1
Step-by-step explanation:
Answer:
the first one
Step-by-step explanation:
Suppose the one's digit is x, the ten's digit is y. the original number is 10y+x, the reversed number is 10x+y
x+y=13
(10x+y)=(10y+x)-9 =>9y-9x=9 =>y-x=1
Add the two equation to solve: 2y=14 =>y=7
x=13-7=6
the original number is 76.
Answer: 
Step-by-step explanation:

plugging in the values we know:

Therefore,





