1. when you substitute you get a= 5+3(4-2)

a= 5+3*2

a=11

2. a. First you must do the multiplication

y= 3(x^2-2x+5x-10)

y=3(x^2+3x-10)

y=3x^2+9x-30

3. b

I`m not really sure what you meant in a, but if IÂ´m correct you meant that y=5 and x=10. Then, the only correct is 10/15

I couldnÂ´t see the table either.

As for c, once you resolve it you get y=(x/4)+5. So, it`s not the same.