Question

give me full answer if someone give me full answer I will market brainlist​

Answer 1

he is at depth 4.5 from sea level because mean level is equal to sea level (0+4.5=4.5)

and height -4.5 from sea level(0-4.5=-4.5)

Answer 2

Hi

here is your answer

the mean sea level is 0

THEN

$4.5 \: is \: the \: depth$

$so \: 0 - 4.5$

$= - 4.5$

So the answer is

$- 4.5$

Hope it will help you

Please mark it as brainlist