Of what?????? Need more info
Answer:

Step-by-step explanation:
U can reduce this into

Which is a square.
In order to solve a proportion you need to cross multiply, so you would do:
4x20 and 9xX and you would get...
9x=80
then divide by nine to get
x=8.8888888889
which is technically 8.9
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Answer:
The temperature at the base camp Friday evening is - 6 degrees Celsius.
Step-by-step explanation:
To get the temperature at a mountain base camp on Friday evening, we must translate statement into a mathematical form:
(i) <em>The temperature at a moutain base camp was - 2 degress Celsius on Thursday</em>:

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

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

The temperature at the base camp Friday evening is:



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