Answer:
Confidence interval: (1760,1956)
Step-by-step explanation:
We are given the following information in the question:
Sample size, n = 81
Sample mean =

Population standard deviation =

Confidence Level = 95%
Significance level = 5% = 0.05
Confidence interval:

Putting the values, we get,


Answer:
all sides have different lengths
and the third angle measures 90⁰
(Answer: 120) angle EHF = 90 degrees+30 degrees=120 angle
The answer would be -5x^2 + 10x + 40 over x