I m getting 308.11, there is an additional 0.60 that is added, maybe your source is wrong, or there is a copying error.
I think one is c And 2 I think is a I just use the desmos graphing calculator at desmos.com
Represent the sum 1,I think,I don't know
Cost=$200
sales tax rate, r= 8%
tax=cost*r=$200*0.08=$16
total cost = cost+tax=$200+$16=$216
Answer:
A. 12
Step-by-step explanation:
Selecting B, C, or D would create a difference of perfect squares since each of these numbers are perfect squares. Additional factoring would then be needed.
But selecting 12 gives 
which cannot be factored. It is factored completely.
