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?
A -280 feet
- 47 feet
-33 feet
D
- 6 feet

Option A -280 feet

Step-by-step explanation:

Let

x ----> the lowest elevation in Long Beach, California in feet

y ----> the approximate elevation of Death Valley in feet

Remember that

An elevation below the sea level is negative and above the sea level is positive (The sea level is the level zero)

we know that

The lowest elevation in Long Beach, California, is 7 feet below sea level

so

The elevation  of Death Valley is about 40 times lower than the elevation of Long Beach.

so

substitute the value of x

therefore

The approximate elevation of Death Valley is about 280 feet below the sea level