3. 5mn ( 2m + 6n + 1 )
4. 4a^3b^2c ( 18a^2b - 8c )
5. (X-15)(X+15)
6. -4(y-4.5)(y+4.5)
8. 2X(X-10)(X+10)
i am not sure if no. 8 is right
Answer: Ron tower's
Step-by-step explanation:
Given
Ron tower has a base of 
Freddy tower has a base of 
Suppose the tower is in the shape of a square prism
The volume of Ron and Freddy tower is 
The volume of a square-based prism is

The height of Freddy tower is

Thus, the height of Ron's tower is more than Freddy's tower by 
Hello here is a solution :
<span>h(g(f(x))) ?
</span>g(f(x))= g(2x+5)=(2x+5)²=(2x)²+2(2x)(5)+5² = 4x²+20x+25
h(g(f(x)))(x) = h(4x²+20x+25) = -2(4x²+20x+25)
h(g(f(x)))(x) = -8x²-40x-50