# 5.6.2 Self-Check on Negative Numbers

## Exercise 3: Cold Temperatures

Write down the temperatures that are described in the following situations.

(a) The temperature was 3 °C during the day, but it fell by seven degrees Celsius overnight. What was the minimum temperature during the night?

As , the minimum temperature was –4 °C.

(b) In Moscow, the temperature outside was six degrees Celsius colder than the freezer. If the freezer temperature was 18 °C, what was the outside temperature?

As , the outside temperature in Moscow was 24 °C.

(c) The temperature outside is 5 °C. If it rises by seven degrees Celsius what is the new temperature?

As , the new temperature is 2 °C.

## Exercise 4: Mt. Everest versus the Dead Sea

Mt. Everest, the highest elevation on Earth, is 29,028 feet above sea level. The shore of the Dead Sea is 1,312 feet below sea level, the lowest point on land. What is the difference between these extreme points on Earth?

The difference between extremes is .

## Exercise 5: Yellow Submarine

A submarine was situated 450 feet below sea level. If it descends 300 feet, what is its new position?

The submarine is now located at feet or 750 feet below sea level.

## Exercise 6: Battle of the Deserts

In the Sahara Desert, during the day, it was 136 °F. In the Gobi Desert, at night, a temperature of 50 °F was recorded. What is the difference between these two temperatures?