10% of 1800 is 180. If she payed 180 ten times it would be 1800 dollars. The computer is 180 dollars off. 1800-180= 1620. She pays $1620
5 because a thousand means 1000 and u got 5 times 1000 so its 5000
The new mixture has a total volume of 5 L + 9 L = 14 L.
70% of the 5 L alcohol solution is alcohol, so that it contributed 3.5 L of alcohol to the mixture. The pure water contributed no alcohol. So in the mixture, the concentration of alcohol is
3.5 L / 14 L = 0.25, or 25%
Answer:
x=2.17
Step-by-step explanation:
+18x+81=-4
-81 -81
+18x= -85
/18 /18
= -4.7
= 
x= 2.17
I hope this helps :) (if it does, brainliest, please??)