Question

The lowest elevation in Long Beach California is 7 feet below sea level the elevation of Death Valley is about 40 times lower than the elevation of Long Beach what is the approximate elevation of Death Valley
$- 7 - 40$

Answer 1

If we are talking about the lowest elevation, it would be -7
if Death Valley is 40 times lower than the lowest elevation of Long Beach 
u would multiply the 2
so 40x7=280
then you subtract from -7
-7-280=-287
the approximate elevation of Death Valley is -287 feet below sea level