4,8,12,16,20,24,28,32,36,40
Following PEMDAS.
It would go like 5x0.11
Answer. = .55
If the vertex is at the maximum point they dy/dx=0 at that point...
dA/dx=-2x+4
dB/dx=-2x+8
dC/dx=2x-4
dD/dx=2x-8
So both B and D have a zero velocity at x=4, but only B is equal to 3 when x=4
B. is the correct quadratic with the vertex at (4,3)
The last one 6^O because it equals 1