Answer:
28 legs are on the ground
x = -4
Step-by-step explanation:
x = 3 - 7
x = - (7 - 3)
f’(x) = x -2/7
Let f(x)= y
Thus;
y = x + 2/7
x = y-2/7
So the inverse f’(x) = x - 2/7