bsmith892341
15.10.2020 •
Mathematics
The temperature at a mountain base camp was −5 degrees Celsius on Wednesday. Thursday morning, the temperature was 2 degrees Celsius lower than it was on Wednesday. By Thursday evening, the temperature was 1 degree Celsius lower than it was that morning. What was the temperature at the base camp Thursday evening?
A: −9 degrees Celsius
B: −8 degrees Celsius
C:−7 degrees Celsius
D: −6 degrees Celsius
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Ответ:
I think it's B: -8 degrees Celsius
Ответ:
Consider triangles CDF and FDB. In these triangles the heights drawn to the sides CF and FB are the same. Then
Then
Consider triangle BCD. The area of this triangle is
Consider triangle ABC, the area of triangle ABC is
168 cm².