She used the associative property which should only be used with positive numbers (sorry if it isn't the answer you're looking for)
Answer:
The answer would be Set: "S" = the set of natural numbers greater than 11.
Hope this helps!
Answer:
screw this question
Step-by-step explanation:
To change from 15% to 25% he needs to add 10%.
If the solution is 50ml then he needs to add 10% which is 5ml... But if he adds 5 ml then the solution will be 55ml total, so that doesn't make sense. He has to take some of the solution that's not acid before adding the 5ml...
Answer:
Step-by-step explanation:
Given
Economic system Q is given by

also 
if 



substitute these values




differentiate w.r.t to L to get 



< 1 and < 2......adjacent angles...because they have a common side and a comon vertex
< 1 and < 2.....complimentary angles....because when added, they equal 90