Answer:
y-4=-2(x+4)
Step-by-step explanation:
Perpendicular means negative reciprocal of the slope.
y-y1=m(x-x1)
y-4=-2(x-(-4))
357.5ft deep
Every second, the shark descend 35.75ft. In ten seconds the shark will have gone 10 times deeper. 35.75 times 10 is 357.5.