For the division part:

But I think your question differs than this..
Am I right?
as your options do not include 1
Answer: -11 meters
Step-by-step explanation:
so for the waters surface, we are going to call that 0. if bob is at 15 meters below 0, then -15+4=-11, so he would be at-11 meters in relation to the waters surface.
Answer:
a)At 10min= Jo arrived at the destination and prepare to return.
b)8km/h
Step-by-step explanation:
speed = distance/time 30/3.75=8
Hope this helps
Answer:
Assume that the expression is:
r = √(A)/3
Multiply both sides by 3:
3r = √(A)
Finally, square both sides to get:
A = (3r)²
= 9r²
I hope this helps!
Step-by-step explanation: