2. 4b^2/5a
3. C-1
Your welcome
Well to do this correctly it would have to be a but not techonology.
Answer:
12
Step-by-step explanation:

sum means addition ......... quotient means division
7 + 
=
+ 
= 
Answer:
second
Step-by-step explanation:
substitute y=6 and x=1 in the given relations and see if works
y=2x will be 6 = 2*1 false
y=x+5 will be 6 = 1+5 true
because this is true check all the other y and x and if all true is good
7=2+5 true, 8=3+5 true 9= 4+5 true, 10=5+5 true, so second is good
y=2x+1 will be 6=2*1+1 false
y=3x+1 will be 6=3*1+1 false