Question

(02.03 MC) The temperature at a mountain base camp was −2 degrees Celsius on Thursday. Friday morning, the temperature was 1 degree Celsius lower than it was on Thursday. By Friday evening, the temperature was 3 degrees Celsius lower than it was that morning. What was the temperature at the base camp Friday evening? (1 point) −9 degrees Celsius −8 degrees Celsius −7 degrees Celsius −6 degrees Celsius

Answer 1

D) -6 degrees Celsius

Answer 2

The temperature at the base camp Friday evening is - 6 degrees Celsius.

Explanation:

To get the temperature at a mountain base camp on Friday evening, we must translate statement into a mathematical form:

(i) The temperature at a moutain base camp was - 2 degress Celsius on Thursday:

`T_(o) = -2\,^(\circ)C`

(ii) Friday morning, the temperature was 1 degree Celsius lower than it was on Thursday:

`\Delta T_(1) = -1\,^(\circ)C`

(iii) Friday evening, the temperature was 3 degrees Celsius lower that it was that morning:

`\Delta T_(2) = -3\,^(\circ)C`

The temperature at the base camp Friday evening is:

`T = T_(o)+\Delta T_(1)+\Delta T_(2)`

`T = -2\,^(\circ)C-1\,^(\circ)C-3\,^(\circ)C`

`T = -6\,^(\circ)C`

The temperature at the base camp Friday evening is - 6 degrees Celsius.