I will do the first one only. The second question is done the same way.
Replace every x you see in the function with 2b and do the math.
f(x) = x^2 + 2x + 1
Let x = 2b
f(2b) = (2b)^2 + 2(2b) + 1
f(2b) = 4b^2 + 4b + 1
Did you follow? That's all there is to it.
The answer is B. 6.3 * 10^6
6.3 * 10^6 = 6,300,000
Hope this helps!
Volume = π (3.14)×22^2×12.5 = 18,997 inches³
B. The perimeter increases by 44%