If x = 12 inches and y = 18 inches, where y is the height of each triangle of the pyramid, what is the surface area of the figure?

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this

download photomath it will give you the answer and show u the steps

i believe the answer is y=0.25x+-3