Answer:
a. Jake told the negative value of the expression which cannot be equivalent to the original expression.
b. 10 -
g
Step-by-step explanation:
a. The given expression is: 
Multiplying through out by -, we get:
which was the expression given by Jake. Since, it is the negative of the original one, they cannot be equivalent.
b. 

Hence, the answer.
Answer:
21. is 18 dollars
22. is 75 dollars
Step-by-step explanation:
Are you asking for a place or the population?