Number 4 is correct a^0=1 for all real number a
number 5
y^2(y^2=y^(2+2)=y^4 correct
y^6/y^2=y^(6-2)=y^4 correct
y^0=1 false
y^9/y^5=y^(9-5)=y^4 correct
y^4(y^1)=y^(4+1)=y^5 false
Answer:
Let's just call the number x. 3/8ths of x and 1 more equals 11.
As an equation, this basically means

There are 16 cups in 1 gallon:
16 x 2.75 = 44 cups
True, each number is getting doubled, both sides are proportionally staying the same.