You have to switch the 8 to the left and the y to the right which would change the equation to 9-8=y
y=1
-6+10c
I think, reorder the terms: -6+9c+c= -6+10c
Pv=4,725×((1−(1+0.10÷2)^(−2
×15))÷(0.10÷2))=72,634.83

which means the parabola lies above the x-axis over its entire domain. This means the area is given by