Vertical parabola opens down so (y-k)^2=4P(x-h) (h,k) is center P is distance from directix to center and from center to focus (it is 1/2 distance between focus and directix) -1 to -1/2 is a distance of 1/2 1/2 of 1/2=1/4 P=1/4
so move 1/4 down from -1/2 -3/4 center is (2,-3/4)
so y+3/4=(x-2)^2 minus 3/4 y=(x-2)^2-3/4 f(x)=(x-2)^2-3/4
you made an error, either the last or first option doesn't have -(x+2)^2
Calculating wattage is a quick process once you know the appliance's amperage and voltage — you simply multiply the two figures. An appliance that uses 110 volts of electricity and 5 amps uses 550 watts.
