Answer:
$55
Step-by-step explanation:
its $150 - $40 = $110
$110 / 2 = $55
dy/dx = d/dx log root under x-1 / root under x+1
dy/dx = root under x+1 / root under x-1 * 1/(x+1)^2/3 * 1/root under x-1
dy/dx = (x+1)^2/ x-1
Not sure about this one sorry bud